diff --git a/website/content/ChapterFour/0001.Two-Sum.md b/website/content/ChapterFour/0001~0099/0001.Two-Sum.md
similarity index 100%
rename from website/content/ChapterFour/0001.Two-Sum.md
rename to website/content/ChapterFour/0001~0099/0001.Two-Sum.md
diff --git a/website/content/ChapterFour/0002.Add-Two-Numbers.md b/website/content/ChapterFour/0001~0099/0002.Add-Two-Numbers.md
similarity index 100%
rename from website/content/ChapterFour/0002.Add-Two-Numbers.md
rename to website/content/ChapterFour/0001~0099/0002.Add-Two-Numbers.md
diff --git a/website/content/ChapterFour/0003.Longest-Substring-Without-Repeating-Characters.md b/website/content/ChapterFour/0001~0099/0003.Longest-Substring-Without-Repeating-Characters.md
similarity index 100%
rename from website/content/ChapterFour/0003.Longest-Substring-Without-Repeating-Characters.md
rename to website/content/ChapterFour/0001~0099/0003.Longest-Substring-Without-Repeating-Characters.md
diff --git a/website/content/ChapterFour/0004.Median-of-Two-Sorted-Arrays.md b/website/content/ChapterFour/0001~0099/0004.Median-of-Two-Sorted-Arrays.md
similarity index 100%
rename from website/content/ChapterFour/0004.Median-of-Two-Sorted-Arrays.md
rename to website/content/ChapterFour/0001~0099/0004.Median-of-Two-Sorted-Arrays.md
diff --git a/website/content/ChapterFour/0007.Reverse-Integer.md b/website/content/ChapterFour/0001~0099/0007.Reverse-Integer.md
similarity index 100%
rename from website/content/ChapterFour/0007.Reverse-Integer.md
rename to website/content/ChapterFour/0001~0099/0007.Reverse-Integer.md
diff --git a/website/content/ChapterFour/0009.Palindrome-Number.md b/website/content/ChapterFour/0001~0099/0009.Palindrome-Number.md
similarity index 100%
rename from website/content/ChapterFour/0009.Palindrome-Number.md
rename to website/content/ChapterFour/0001~0099/0009.Palindrome-Number.md
diff --git a/website/content/ChapterFour/0011.Container-With-Most-Water.md b/website/content/ChapterFour/0001~0099/0011.Container-With-Most-Water.md
similarity index 100%
rename from website/content/ChapterFour/0011.Container-With-Most-Water.md
rename to website/content/ChapterFour/0001~0099/0011.Container-With-Most-Water.md
diff --git a/website/content/ChapterFour/0013.Roman-to-Integer.md b/website/content/ChapterFour/0001~0099/0013.Roman-to-Integer.md
similarity index 100%
rename from website/content/ChapterFour/0013.Roman-to-Integer.md
rename to website/content/ChapterFour/0001~0099/0013.Roman-to-Integer.md
diff --git a/website/content/ChapterFour/0015.3Sum.md b/website/content/ChapterFour/0001~0099/0015.3Sum.md
similarity index 100%
rename from website/content/ChapterFour/0015.3Sum.md
rename to website/content/ChapterFour/0001~0099/0015.3Sum.md
diff --git a/website/content/ChapterFour/0016.3Sum-Closest.md b/website/content/ChapterFour/0001~0099/0016.3Sum-Closest.md
similarity index 100%
rename from website/content/ChapterFour/0016.3Sum-Closest.md
rename to website/content/ChapterFour/0001~0099/0016.3Sum-Closest.md
diff --git a/website/content/ChapterFour/0017.Letter-Combinations-of-a-Phone-Number.md b/website/content/ChapterFour/0001~0099/0017.Letter-Combinations-of-a-Phone-Number.md
similarity index 100%
rename from website/content/ChapterFour/0017.Letter-Combinations-of-a-Phone-Number.md
rename to website/content/ChapterFour/0001~0099/0017.Letter-Combinations-of-a-Phone-Number.md
diff --git a/website/content/ChapterFour/0018.4Sum.md b/website/content/ChapterFour/0001~0099/0018.4Sum.md
similarity index 100%
rename from website/content/ChapterFour/0018.4Sum.md
rename to website/content/ChapterFour/0001~0099/0018.4Sum.md
diff --git a/website/content/ChapterFour/0019.Remove-Nth-Node-From-End-of-List.md b/website/content/ChapterFour/0001~0099/0019.Remove-Nth-Node-From-End-of-List.md
similarity index 100%
rename from website/content/ChapterFour/0019.Remove-Nth-Node-From-End-of-List.md
rename to website/content/ChapterFour/0001~0099/0019.Remove-Nth-Node-From-End-of-List.md
diff --git a/website/content/ChapterFour/0020.Valid-Parentheses.md b/website/content/ChapterFour/0001~0099/0020.Valid-Parentheses.md
similarity index 100%
rename from website/content/ChapterFour/0020.Valid-Parentheses.md
rename to website/content/ChapterFour/0001~0099/0020.Valid-Parentheses.md
diff --git a/website/content/ChapterFour/0021.Merge-Two-Sorted-Lists.md b/website/content/ChapterFour/0001~0099/0021.Merge-Two-Sorted-Lists.md
similarity index 100%
rename from website/content/ChapterFour/0021.Merge-Two-Sorted-Lists.md
rename to website/content/ChapterFour/0001~0099/0021.Merge-Two-Sorted-Lists.md
diff --git a/website/content/ChapterFour/0022.Generate-Parentheses.md b/website/content/ChapterFour/0001~0099/0022.Generate-Parentheses.md
similarity index 100%
rename from website/content/ChapterFour/0022.Generate-Parentheses.md
rename to website/content/ChapterFour/0001~0099/0022.Generate-Parentheses.md
diff --git a/website/content/ChapterFour/0023.Merge-k-Sorted-Lists.md b/website/content/ChapterFour/0001~0099/0023.Merge-k-Sorted-Lists.md
similarity index 100%
rename from website/content/ChapterFour/0023.Merge-k-Sorted-Lists.md
rename to website/content/ChapterFour/0001~0099/0023.Merge-k-Sorted-Lists.md
diff --git a/website/content/ChapterFour/0024.Swap-Nodes-in-Pairs.md b/website/content/ChapterFour/0001~0099/0024.Swap-Nodes-in-Pairs.md
similarity index 100%
rename from website/content/ChapterFour/0024.Swap-Nodes-in-Pairs.md
rename to website/content/ChapterFour/0001~0099/0024.Swap-Nodes-in-Pairs.md
diff --git a/website/content/ChapterFour/0025.Reverse-Nodes-in-k-Group.md b/website/content/ChapterFour/0001~0099/0025.Reverse-Nodes-in-k-Group.md
similarity index 100%
rename from website/content/ChapterFour/0025.Reverse-Nodes-in-k-Group.md
rename to website/content/ChapterFour/0001~0099/0025.Reverse-Nodes-in-k-Group.md
diff --git a/website/content/ChapterFour/0026.Remove-Duplicates-from-Sorted-Array.md b/website/content/ChapterFour/0001~0099/0026.Remove-Duplicates-from-Sorted-Array.md
similarity index 100%
rename from website/content/ChapterFour/0026.Remove-Duplicates-from-Sorted-Array.md
rename to website/content/ChapterFour/0001~0099/0026.Remove-Duplicates-from-Sorted-Array.md
diff --git a/website/content/ChapterFour/0027.Remove-Element.md b/website/content/ChapterFour/0001~0099/0027.Remove-Element.md
similarity index 100%
rename from website/content/ChapterFour/0027.Remove-Element.md
rename to website/content/ChapterFour/0001~0099/0027.Remove-Element.md
diff --git a/website/content/ChapterFour/0028.Implement-strStr.md b/website/content/ChapterFour/0001~0099/0028.Implement-strStr.md
similarity index 100%
rename from website/content/ChapterFour/0028.Implement-strStr.md
rename to website/content/ChapterFour/0001~0099/0028.Implement-strStr.md
diff --git a/website/content/ChapterFour/0029.Divide-Two-Integers.md b/website/content/ChapterFour/0001~0099/0029.Divide-Two-Integers.md
similarity index 100%
rename from website/content/ChapterFour/0029.Divide-Two-Integers.md
rename to website/content/ChapterFour/0001~0099/0029.Divide-Two-Integers.md
diff --git a/website/content/ChapterFour/0030.Substring-with-Concatenation-of-All-Words.md b/website/content/ChapterFour/0001~0099/0030.Substring-with-Concatenation-of-All-Words.md
similarity index 100%
rename from website/content/ChapterFour/0030.Substring-with-Concatenation-of-All-Words.md
rename to website/content/ChapterFour/0001~0099/0030.Substring-with-Concatenation-of-All-Words.md
diff --git a/website/content/ChapterFour/0033.Search-in-Rotated-Sorted-Array.md b/website/content/ChapterFour/0001~0099/0033.Search-in-Rotated-Sorted-Array.md
similarity index 100%
rename from website/content/ChapterFour/0033.Search-in-Rotated-Sorted-Array.md
rename to website/content/ChapterFour/0001~0099/0033.Search-in-Rotated-Sorted-Array.md
diff --git a/website/content/ChapterFour/0034.Find-First-and-Last-Position-of-Element-in-Sorted-Array.md b/website/content/ChapterFour/0001~0099/0034.Find-First-and-Last-Position-of-Element-in-Sorted-Array.md
similarity index 100%
rename from website/content/ChapterFour/0034.Find-First-and-Last-Position-of-Element-in-Sorted-Array.md
rename to website/content/ChapterFour/0001~0099/0034.Find-First-and-Last-Position-of-Element-in-Sorted-Array.md
diff --git a/website/content/ChapterFour/0035.Search-Insert-Position.md b/website/content/ChapterFour/0001~0099/0035.Search-Insert-Position.md
similarity index 100%
rename from website/content/ChapterFour/0035.Search-Insert-Position.md
rename to website/content/ChapterFour/0001~0099/0035.Search-Insert-Position.md
diff --git a/website/content/ChapterFour/0036.Valid-Sudoku.md b/website/content/ChapterFour/0001~0099/0036.Valid-Sudoku.md
similarity index 100%
rename from website/content/ChapterFour/0036.Valid-Sudoku.md
rename to website/content/ChapterFour/0001~0099/0036.Valid-Sudoku.md
diff --git a/website/content/ChapterFour/0037.Sudoku-Solver.md b/website/content/ChapterFour/0001~0099/0037.Sudoku-Solver.md
similarity index 100%
rename from website/content/ChapterFour/0037.Sudoku-Solver.md
rename to website/content/ChapterFour/0001~0099/0037.Sudoku-Solver.md
diff --git a/website/content/ChapterFour/0039.Combination-Sum.md b/website/content/ChapterFour/0001~0099/0039.Combination-Sum.md
similarity index 100%
rename from website/content/ChapterFour/0039.Combination-Sum.md
rename to website/content/ChapterFour/0001~0099/0039.Combination-Sum.md
diff --git a/website/content/ChapterFour/0040.Combination-Sum-II.md b/website/content/ChapterFour/0001~0099/0040.Combination-Sum-II.md
similarity index 100%
rename from website/content/ChapterFour/0040.Combination-Sum-II.md
rename to website/content/ChapterFour/0001~0099/0040.Combination-Sum-II.md
diff --git a/website/content/ChapterFour/0041.First-Missing-Positive.md b/website/content/ChapterFour/0001~0099/0041.First-Missing-Positive.md
similarity index 100%
rename from website/content/ChapterFour/0041.First-Missing-Positive.md
rename to website/content/ChapterFour/0001~0099/0041.First-Missing-Positive.md
diff --git a/website/content/ChapterFour/0042.Trapping-Rain-Water.md b/website/content/ChapterFour/0001~0099/0042.Trapping-Rain-Water.md
similarity index 100%
rename from website/content/ChapterFour/0042.Trapping-Rain-Water.md
rename to website/content/ChapterFour/0001~0099/0042.Trapping-Rain-Water.md
diff --git a/website/content/ChapterFour/0046.Permutations.md b/website/content/ChapterFour/0001~0099/0046.Permutations.md
similarity index 100%
rename from website/content/ChapterFour/0046.Permutations.md
rename to website/content/ChapterFour/0001~0099/0046.Permutations.md
diff --git a/website/content/ChapterFour/0047.Permutations-II.md b/website/content/ChapterFour/0001~0099/0047.Permutations-II.md
similarity index 100%
rename from website/content/ChapterFour/0047.Permutations-II.md
rename to website/content/ChapterFour/0001~0099/0047.Permutations-II.md
diff --git a/website/content/ChapterFour/0048.Rotate-Image.md b/website/content/ChapterFour/0001~0099/0048.Rotate-Image.md
similarity index 100%
rename from website/content/ChapterFour/0048.Rotate-Image.md
rename to website/content/ChapterFour/0001~0099/0048.Rotate-Image.md
diff --git a/website/content/ChapterFour/0049.Group-Anagrams.md b/website/content/ChapterFour/0001~0099/0049.Group-Anagrams.md
similarity index 100%
rename from website/content/ChapterFour/0049.Group-Anagrams.md
rename to website/content/ChapterFour/0001~0099/0049.Group-Anagrams.md
diff --git a/website/content/ChapterFour/0050.Powx-n.md b/website/content/ChapterFour/0001~0099/0050.Powx-n.md
similarity index 100%
rename from website/content/ChapterFour/0050.Powx-n.md
rename to website/content/ChapterFour/0001~0099/0050.Powx-n.md
diff --git a/website/content/ChapterFour/0051.N-Queens.md b/website/content/ChapterFour/0001~0099/0051.N-Queens.md
similarity index 100%
rename from website/content/ChapterFour/0051.N-Queens.md
rename to website/content/ChapterFour/0001~0099/0051.N-Queens.md
diff --git a/website/content/ChapterFour/0052.N-Queens-II.md b/website/content/ChapterFour/0001~0099/0052.N-Queens-II.md
similarity index 100%
rename from website/content/ChapterFour/0052.N-Queens-II.md
rename to website/content/ChapterFour/0001~0099/0052.N-Queens-II.md
diff --git a/website/content/ChapterFour/0053.Maximum-Subarray.md b/website/content/ChapterFour/0001~0099/0053.Maximum-Subarray.md
similarity index 100%
rename from website/content/ChapterFour/0053.Maximum-Subarray.md
rename to website/content/ChapterFour/0001~0099/0053.Maximum-Subarray.md
diff --git a/website/content/ChapterFour/0054.Spiral-Matrix.md b/website/content/ChapterFour/0001~0099/0054.Spiral-Matrix.md
similarity index 100%
rename from website/content/ChapterFour/0054.Spiral-Matrix.md
rename to website/content/ChapterFour/0001~0099/0054.Spiral-Matrix.md
diff --git a/website/content/ChapterFour/0055.Jump-Game.md b/website/content/ChapterFour/0001~0099/0055.Jump-Game.md
similarity index 100%
rename from website/content/ChapterFour/0055.Jump-Game.md
rename to website/content/ChapterFour/0001~0099/0055.Jump-Game.md
diff --git a/website/content/ChapterFour/0056.Merge-Intervals.md b/website/content/ChapterFour/0001~0099/0056.Merge-Intervals.md
similarity index 100%
rename from website/content/ChapterFour/0056.Merge-Intervals.md
rename to website/content/ChapterFour/0001~0099/0056.Merge-Intervals.md
diff --git a/website/content/ChapterFour/0057.Insert-Interval.md b/website/content/ChapterFour/0001~0099/0057.Insert-Interval.md
similarity index 100%
rename from website/content/ChapterFour/0057.Insert-Interval.md
rename to website/content/ChapterFour/0001~0099/0057.Insert-Interval.md
diff --git a/website/content/ChapterFour/0059.Spiral-Matrix-II.md b/website/content/ChapterFour/0001~0099/0059.Spiral-Matrix-II.md
similarity index 100%
rename from website/content/ChapterFour/0059.Spiral-Matrix-II.md
rename to website/content/ChapterFour/0001~0099/0059.Spiral-Matrix-II.md
diff --git a/website/content/ChapterFour/0060.Permutation-Sequence.md b/website/content/ChapterFour/0001~0099/0060.Permutation-Sequence.md
similarity index 100%
rename from website/content/ChapterFour/0060.Permutation-Sequence.md
rename to website/content/ChapterFour/0001~0099/0060.Permutation-Sequence.md
diff --git a/website/content/ChapterFour/0061.Rotate-List.md b/website/content/ChapterFour/0001~0099/0061.Rotate-List.md
similarity index 100%
rename from website/content/ChapterFour/0061.Rotate-List.md
rename to website/content/ChapterFour/0001~0099/0061.Rotate-List.md
diff --git a/website/content/ChapterFour/0062.Unique-Paths.md b/website/content/ChapterFour/0001~0099/0062.Unique-Paths.md
similarity index 100%
rename from website/content/ChapterFour/0062.Unique-Paths.md
rename to website/content/ChapterFour/0001~0099/0062.Unique-Paths.md
diff --git a/website/content/ChapterFour/0063.Unique-Paths-II.md b/website/content/ChapterFour/0001~0099/0063.Unique-Paths-II.md
similarity index 100%
rename from website/content/ChapterFour/0063.Unique-Paths-II.md
rename to website/content/ChapterFour/0001~0099/0063.Unique-Paths-II.md
diff --git a/website/content/ChapterFour/0064.Minimum-Path-Sum.md b/website/content/ChapterFour/0001~0099/0064.Minimum-Path-Sum.md
similarity index 100%
rename from website/content/ChapterFour/0064.Minimum-Path-Sum.md
rename to website/content/ChapterFour/0001~0099/0064.Minimum-Path-Sum.md
diff --git a/website/content/ChapterFour/0066.Plus-One.md b/website/content/ChapterFour/0001~0099/0066.Plus-One.md
similarity index 100%
rename from website/content/ChapterFour/0066.Plus-One.md
rename to website/content/ChapterFour/0001~0099/0066.Plus-One.md
diff --git a/website/content/ChapterFour/0067.Add-Binary.md b/website/content/ChapterFour/0001~0099/0067.Add-Binary.md
similarity index 100%
rename from website/content/ChapterFour/0067.Add-Binary.md
rename to website/content/ChapterFour/0001~0099/0067.Add-Binary.md
diff --git a/website/content/ChapterFour/0069.Sqrtx.md b/website/content/ChapterFour/0001~0099/0069.Sqrtx.md
similarity index 100%
rename from website/content/ChapterFour/0069.Sqrtx.md
rename to website/content/ChapterFour/0001~0099/0069.Sqrtx.md
diff --git a/website/content/ChapterFour/0070.Climbing-Stairs.md b/website/content/ChapterFour/0001~0099/0070.Climbing-Stairs.md
similarity index 100%
rename from website/content/ChapterFour/0070.Climbing-Stairs.md
rename to website/content/ChapterFour/0001~0099/0070.Climbing-Stairs.md
diff --git a/website/content/ChapterFour/0071.Simplify-Path.md b/website/content/ChapterFour/0001~0099/0071.Simplify-Path.md
similarity index 100%
rename from website/content/ChapterFour/0071.Simplify-Path.md
rename to website/content/ChapterFour/0001~0099/0071.Simplify-Path.md
diff --git a/website/content/ChapterFour/0074.Search-a-2D-Matrix.md b/website/content/ChapterFour/0001~0099/0074.Search-a-2D-Matrix.md
similarity index 100%
rename from website/content/ChapterFour/0074.Search-a-2D-Matrix.md
rename to website/content/ChapterFour/0001~0099/0074.Search-a-2D-Matrix.md
diff --git a/website/content/ChapterFour/0075.Sort-Colors.md b/website/content/ChapterFour/0001~0099/0075.Sort-Colors.md
similarity index 100%
rename from website/content/ChapterFour/0075.Sort-Colors.md
rename to website/content/ChapterFour/0001~0099/0075.Sort-Colors.md
diff --git a/website/content/ChapterFour/0076.Minimum-Window-Substring.md b/website/content/ChapterFour/0001~0099/0076.Minimum-Window-Substring.md
similarity index 100%
rename from website/content/ChapterFour/0076.Minimum-Window-Substring.md
rename to website/content/ChapterFour/0001~0099/0076.Minimum-Window-Substring.md
diff --git a/website/content/ChapterFour/0077.Combinations.md b/website/content/ChapterFour/0001~0099/0077.Combinations.md
similarity index 100%
rename from website/content/ChapterFour/0077.Combinations.md
rename to website/content/ChapterFour/0001~0099/0077.Combinations.md
diff --git a/website/content/ChapterFour/0078.Subsets.md b/website/content/ChapterFour/0001~0099/0078.Subsets.md
similarity index 100%
rename from website/content/ChapterFour/0078.Subsets.md
rename to website/content/ChapterFour/0001~0099/0078.Subsets.md
diff --git a/website/content/ChapterFour/0079.Word-Search.md b/website/content/ChapterFour/0001~0099/0079.Word-Search.md
similarity index 100%
rename from website/content/ChapterFour/0079.Word-Search.md
rename to website/content/ChapterFour/0001~0099/0079.Word-Search.md
diff --git a/website/content/ChapterFour/0080.Remove-Duplicates-from-Sorted-Array-II.md b/website/content/ChapterFour/0001~0099/0080.Remove-Duplicates-from-Sorted-Array-II.md
similarity index 100%
rename from website/content/ChapterFour/0080.Remove-Duplicates-from-Sorted-Array-II.md
rename to website/content/ChapterFour/0001~0099/0080.Remove-Duplicates-from-Sorted-Array-II.md
diff --git a/website/content/ChapterFour/0081.Search-in-Rotated-Sorted-Array-II.md b/website/content/ChapterFour/0001~0099/0081.Search-in-Rotated-Sorted-Array-II.md
similarity index 100%
rename from website/content/ChapterFour/0081.Search-in-Rotated-Sorted-Array-II.md
rename to website/content/ChapterFour/0001~0099/0081.Search-in-Rotated-Sorted-Array-II.md
diff --git a/website/content/ChapterFour/0082.Remove-Duplicates-from-Sorted-List-II.md b/website/content/ChapterFour/0001~0099/0082.Remove-Duplicates-from-Sorted-List-II.md
similarity index 100%
rename from website/content/ChapterFour/0082.Remove-Duplicates-from-Sorted-List-II.md
rename to website/content/ChapterFour/0001~0099/0082.Remove-Duplicates-from-Sorted-List-II.md
diff --git a/website/content/ChapterFour/0083.Remove-Duplicates-from-Sorted-List.md b/website/content/ChapterFour/0001~0099/0083.Remove-Duplicates-from-Sorted-List.md
similarity index 100%
rename from website/content/ChapterFour/0083.Remove-Duplicates-from-Sorted-List.md
rename to website/content/ChapterFour/0001~0099/0083.Remove-Duplicates-from-Sorted-List.md
diff --git a/website/content/ChapterFour/0084.Largest-Rectangle-in-Histogram.md b/website/content/ChapterFour/0001~0099/0084.Largest-Rectangle-in-Histogram.md
similarity index 100%
rename from website/content/ChapterFour/0084.Largest-Rectangle-in-Histogram.md
rename to website/content/ChapterFour/0001~0099/0084.Largest-Rectangle-in-Histogram.md
diff --git a/website/content/ChapterFour/0086.Partition-List.md b/website/content/ChapterFour/0001~0099/0086.Partition-List.md
similarity index 100%
rename from website/content/ChapterFour/0086.Partition-List.md
rename to website/content/ChapterFour/0001~0099/0086.Partition-List.md
diff --git a/website/content/ChapterFour/0088.Merge-Sorted-Array.md b/website/content/ChapterFour/0001~0099/0088.Merge-Sorted-Array.md
similarity index 100%
rename from website/content/ChapterFour/0088.Merge-Sorted-Array.md
rename to website/content/ChapterFour/0001~0099/0088.Merge-Sorted-Array.md
diff --git a/website/content/ChapterFour/0089.Gray-Code.md b/website/content/ChapterFour/0001~0099/0089.Gray-Code.md
similarity index 100%
rename from website/content/ChapterFour/0089.Gray-Code.md
rename to website/content/ChapterFour/0001~0099/0089.Gray-Code.md
diff --git a/website/content/ChapterFour/0090.Subsets-II.md b/website/content/ChapterFour/0001~0099/0090.Subsets-II.md
similarity index 100%
rename from website/content/ChapterFour/0090.Subsets-II.md
rename to website/content/ChapterFour/0001~0099/0090.Subsets-II.md
diff --git a/website/content/ChapterFour/0091.Decode-Ways.md b/website/content/ChapterFour/0001~0099/0091.Decode-Ways.md
similarity index 100%
rename from website/content/ChapterFour/0091.Decode-Ways.md
rename to website/content/ChapterFour/0001~0099/0091.Decode-Ways.md
diff --git a/website/content/ChapterFour/0092.Reverse-Linked-List-II.md b/website/content/ChapterFour/0001~0099/0092.Reverse-Linked-List-II.md
similarity index 100%
rename from website/content/ChapterFour/0092.Reverse-Linked-List-II.md
rename to website/content/ChapterFour/0001~0099/0092.Reverse-Linked-List-II.md
diff --git a/website/content/ChapterFour/0093.Restore-IP-Addresses.md b/website/content/ChapterFour/0001~0099/0093.Restore-IP-Addresses.md
similarity index 100%
rename from website/content/ChapterFour/0093.Restore-IP-Addresses.md
rename to website/content/ChapterFour/0001~0099/0093.Restore-IP-Addresses.md
diff --git a/website/content/ChapterFour/0094.Binary-Tree-Inorder-Traversal.md b/website/content/ChapterFour/0001~0099/0094.Binary-Tree-Inorder-Traversal.md
similarity index 100%
rename from website/content/ChapterFour/0094.Binary-Tree-Inorder-Traversal.md
rename to website/content/ChapterFour/0001~0099/0094.Binary-Tree-Inorder-Traversal.md
diff --git a/website/content/ChapterFour/0095.Unique-Binary-Search-Trees-II.md b/website/content/ChapterFour/0001~0099/0095.Unique-Binary-Search-Trees-II.md
similarity index 100%
rename from website/content/ChapterFour/0095.Unique-Binary-Search-Trees-II.md
rename to website/content/ChapterFour/0001~0099/0095.Unique-Binary-Search-Trees-II.md
diff --git a/website/content/ChapterFour/0096.Unique-Binary-Search-Trees.md b/website/content/ChapterFour/0001~0099/0096.Unique-Binary-Search-Trees.md
similarity index 100%
rename from website/content/ChapterFour/0096.Unique-Binary-Search-Trees.md
rename to website/content/ChapterFour/0001~0099/0096.Unique-Binary-Search-Trees.md
diff --git a/website/content/ChapterFour/0098.Validate-Binary-Search-Tree.md b/website/content/ChapterFour/0001~0099/0098.Validate-Binary-Search-Tree.md
similarity index 100%
rename from website/content/ChapterFour/0098.Validate-Binary-Search-Tree.md
rename to website/content/ChapterFour/0001~0099/0098.Validate-Binary-Search-Tree.md
diff --git a/website/content/ChapterFour/0099.Recover-Binary-Search-Tree.md b/website/content/ChapterFour/0001~0099/0099.Recover-Binary-Search-Tree.md
similarity index 100%
rename from website/content/ChapterFour/0099.Recover-Binary-Search-Tree.md
rename to website/content/ChapterFour/0001~0099/0099.Recover-Binary-Search-Tree.md
diff --git a/website/content/ChapterFour/0100.Same-Tree.md b/website/content/ChapterFour/0001~0099/0100.Same-Tree.md
similarity index 100%
rename from website/content/ChapterFour/0100.Same-Tree.md
rename to website/content/ChapterFour/0001~0099/0100.Same-Tree.md
diff --git a/website/content/ChapterFour/0001~0099/_index.md b/website/content/ChapterFour/0001~0099/_index.md
new file mode 100644
index 000000000..d2021683f
--- /dev/null
+++ b/website/content/ChapterFour/0001~0099/_index.md
@@ -0,0 +1,5 @@
+---
+bookCollapseSection: true
+weight: 20
+---
+
diff --git a/website/content/ChapterFour/0101.Symmetric-Tree.md b/website/content/ChapterFour/0100~0199/0101.Symmetric-Tree.md
similarity index 100%
rename from website/content/ChapterFour/0101.Symmetric-Tree.md
rename to website/content/ChapterFour/0100~0199/0101.Symmetric-Tree.md
diff --git a/website/content/ChapterFour/0102.Binary-Tree-Level-Order-Traversal.md b/website/content/ChapterFour/0100~0199/0102.Binary-Tree-Level-Order-Traversal.md
similarity index 100%
rename from website/content/ChapterFour/0102.Binary-Tree-Level-Order-Traversal.md
rename to website/content/ChapterFour/0100~0199/0102.Binary-Tree-Level-Order-Traversal.md
diff --git a/website/content/ChapterFour/0103.Binary-Tree-Zigzag-Level-Order-Traversal.md b/website/content/ChapterFour/0100~0199/0103.Binary-Tree-Zigzag-Level-Order-Traversal.md
similarity index 100%
rename from website/content/ChapterFour/0103.Binary-Tree-Zigzag-Level-Order-Traversal.md
rename to website/content/ChapterFour/0100~0199/0103.Binary-Tree-Zigzag-Level-Order-Traversal.md
diff --git a/website/content/ChapterFour/0104.Maximum-Depth-of-Binary-Tree.md b/website/content/ChapterFour/0100~0199/0104.Maximum-Depth-of-Binary-Tree.md
similarity index 100%
rename from website/content/ChapterFour/0104.Maximum-Depth-of-Binary-Tree.md
rename to website/content/ChapterFour/0100~0199/0104.Maximum-Depth-of-Binary-Tree.md
diff --git a/website/content/ChapterFour/0105.Construct-Binary-Tree-from-Preorder-and-Inorder-Traversal.md b/website/content/ChapterFour/0100~0199/0105.Construct-Binary-Tree-from-Preorder-and-Inorder-Traversal.md
similarity index 100%
rename from website/content/ChapterFour/0105.Construct-Binary-Tree-from-Preorder-and-Inorder-Traversal.md
rename to website/content/ChapterFour/0100~0199/0105.Construct-Binary-Tree-from-Preorder-and-Inorder-Traversal.md
diff --git a/website/content/ChapterFour/0106.Construct-Binary-Tree-from-Inorder-and-Postorder-Traversal.md b/website/content/ChapterFour/0100~0199/0106.Construct-Binary-Tree-from-Inorder-and-Postorder-Traversal.md
similarity index 100%
rename from website/content/ChapterFour/0106.Construct-Binary-Tree-from-Inorder-and-Postorder-Traversal.md
rename to website/content/ChapterFour/0100~0199/0106.Construct-Binary-Tree-from-Inorder-and-Postorder-Traversal.md
diff --git a/website/content/ChapterFour/0107.Binary-Tree-Level-Order-Traversal-II.md b/website/content/ChapterFour/0100~0199/0107.Binary-Tree-Level-Order-Traversal-II.md
similarity index 100%
rename from website/content/ChapterFour/0107.Binary-Tree-Level-Order-Traversal-II.md
rename to website/content/ChapterFour/0100~0199/0107.Binary-Tree-Level-Order-Traversal-II.md
diff --git a/website/content/ChapterFour/0108.Convert-Sorted-Array-to-Binary-Search-Tree.md b/website/content/ChapterFour/0100~0199/0108.Convert-Sorted-Array-to-Binary-Search-Tree.md
similarity index 100%
rename from website/content/ChapterFour/0108.Convert-Sorted-Array-to-Binary-Search-Tree.md
rename to website/content/ChapterFour/0100~0199/0108.Convert-Sorted-Array-to-Binary-Search-Tree.md
diff --git a/website/content/ChapterFour/0109.Convert-Sorted-List-to-Binary-Search-Tree.md b/website/content/ChapterFour/0100~0199/0109.Convert-Sorted-List-to-Binary-Search-Tree.md
similarity index 100%
rename from website/content/ChapterFour/0109.Convert-Sorted-List-to-Binary-Search-Tree.md
rename to website/content/ChapterFour/0100~0199/0109.Convert-Sorted-List-to-Binary-Search-Tree.md
diff --git a/website/content/ChapterFour/0110.Balanced-Binary-Tree.md b/website/content/ChapterFour/0100~0199/0110.Balanced-Binary-Tree.md
similarity index 100%
rename from website/content/ChapterFour/0110.Balanced-Binary-Tree.md
rename to website/content/ChapterFour/0100~0199/0110.Balanced-Binary-Tree.md
diff --git a/website/content/ChapterFour/0111.Minimum-Depth-of-Binary-Tree.md b/website/content/ChapterFour/0100~0199/0111.Minimum-Depth-of-Binary-Tree.md
similarity index 100%
rename from website/content/ChapterFour/0111.Minimum-Depth-of-Binary-Tree.md
rename to website/content/ChapterFour/0100~0199/0111.Minimum-Depth-of-Binary-Tree.md
diff --git a/website/content/ChapterFour/0112.Path-Sum.md b/website/content/ChapterFour/0100~0199/0112.Path-Sum.md
similarity index 100%
rename from website/content/ChapterFour/0112.Path-Sum.md
rename to website/content/ChapterFour/0100~0199/0112.Path-Sum.md
diff --git a/website/content/ChapterFour/0113.Path-Sum-II.md b/website/content/ChapterFour/0100~0199/0113.Path-Sum-II.md
similarity index 100%
rename from website/content/ChapterFour/0113.Path-Sum-II.md
rename to website/content/ChapterFour/0100~0199/0113.Path-Sum-II.md
diff --git a/website/content/ChapterFour/0114.Flatten-Binary-Tree-to-Linked-List.md b/website/content/ChapterFour/0100~0199/0114.Flatten-Binary-Tree-to-Linked-List.md
similarity index 100%
rename from website/content/ChapterFour/0114.Flatten-Binary-Tree-to-Linked-List.md
rename to website/content/ChapterFour/0100~0199/0114.Flatten-Binary-Tree-to-Linked-List.md
diff --git a/website/content/ChapterFour/0118.Pascals-Triangle.md b/website/content/ChapterFour/0100~0199/0118.Pascals-Triangle.md
similarity index 100%
rename from website/content/ChapterFour/0118.Pascals-Triangle.md
rename to website/content/ChapterFour/0100~0199/0118.Pascals-Triangle.md
diff --git a/website/content/ChapterFour/0120.Triangle.md b/website/content/ChapterFour/0100~0199/0120.Triangle.md
similarity index 100%
rename from website/content/ChapterFour/0120.Triangle.md
rename to website/content/ChapterFour/0100~0199/0120.Triangle.md
diff --git a/website/content/ChapterFour/0121.Best-Time-to-Buy-and-Sell-Stock.md b/website/content/ChapterFour/0100~0199/0121.Best-Time-to-Buy-and-Sell-Stock.md
similarity index 100%
rename from website/content/ChapterFour/0121.Best-Time-to-Buy-and-Sell-Stock.md
rename to website/content/ChapterFour/0100~0199/0121.Best-Time-to-Buy-and-Sell-Stock.md
diff --git a/website/content/ChapterFour/0122.Best-Time-to-Buy-and-Sell-Stock-II.md b/website/content/ChapterFour/0100~0199/0122.Best-Time-to-Buy-and-Sell-Stock-II.md
similarity index 100%
rename from website/content/ChapterFour/0122.Best-Time-to-Buy-and-Sell-Stock-II.md
rename to website/content/ChapterFour/0100~0199/0122.Best-Time-to-Buy-and-Sell-Stock-II.md
diff --git a/website/content/ChapterFour/0124.Binary-Tree-Maximum-Path-Sum.md b/website/content/ChapterFour/0100~0199/0124.Binary-Tree-Maximum-Path-Sum.md
similarity index 100%
rename from website/content/ChapterFour/0124.Binary-Tree-Maximum-Path-Sum.md
rename to website/content/ChapterFour/0100~0199/0124.Binary-Tree-Maximum-Path-Sum.md
diff --git a/website/content/ChapterFour/0125.Valid-Palindrome.md b/website/content/ChapterFour/0100~0199/0125.Valid-Palindrome.md
similarity index 100%
rename from website/content/ChapterFour/0125.Valid-Palindrome.md
rename to website/content/ChapterFour/0100~0199/0125.Valid-Palindrome.md
diff --git a/website/content/ChapterFour/0126.Word-Ladder-II.md b/website/content/ChapterFour/0100~0199/0126.Word-Ladder-II.md
similarity index 100%
rename from website/content/ChapterFour/0126.Word-Ladder-II.md
rename to website/content/ChapterFour/0100~0199/0126.Word-Ladder-II.md
diff --git a/website/content/ChapterFour/0127.Word-Ladder.md b/website/content/ChapterFour/0100~0199/0127.Word-Ladder.md
similarity index 100%
rename from website/content/ChapterFour/0127.Word-Ladder.md
rename to website/content/ChapterFour/0100~0199/0127.Word-Ladder.md
diff --git a/website/content/ChapterFour/0128.Longest-Consecutive-Sequence.md b/website/content/ChapterFour/0100~0199/0128.Longest-Consecutive-Sequence.md
similarity index 100%
rename from website/content/ChapterFour/0128.Longest-Consecutive-Sequence.md
rename to website/content/ChapterFour/0100~0199/0128.Longest-Consecutive-Sequence.md
diff --git a/website/content/ChapterFour/0129.Sum-Root-to-Leaf-Numbers.md b/website/content/ChapterFour/0100~0199/0129.Sum-Root-to-Leaf-Numbers.md
similarity index 100%
rename from website/content/ChapterFour/0129.Sum-Root-to-Leaf-Numbers.md
rename to website/content/ChapterFour/0100~0199/0129.Sum-Root-to-Leaf-Numbers.md
diff --git a/website/content/ChapterFour/0130.Surrounded-Regions.md b/website/content/ChapterFour/0100~0199/0130.Surrounded-Regions.md
similarity index 100%
rename from website/content/ChapterFour/0130.Surrounded-Regions.md
rename to website/content/ChapterFour/0100~0199/0130.Surrounded-Regions.md
diff --git a/website/content/ChapterFour/0131.Palindrome-Partitioning.md b/website/content/ChapterFour/0100~0199/0131.Palindrome-Partitioning.md
similarity index 100%
rename from website/content/ChapterFour/0131.Palindrome-Partitioning.md
rename to website/content/ChapterFour/0100~0199/0131.Palindrome-Partitioning.md
diff --git a/website/content/ChapterFour/0136.Single-Number.md b/website/content/ChapterFour/0100~0199/0136.Single-Number.md
similarity index 100%
rename from website/content/ChapterFour/0136.Single-Number.md
rename to website/content/ChapterFour/0100~0199/0136.Single-Number.md
diff --git a/website/content/ChapterFour/0137.Single-Number-II.md b/website/content/ChapterFour/0100~0199/0137.Single-Number-II.md
similarity index 100%
rename from website/content/ChapterFour/0137.Single-Number-II.md
rename to website/content/ChapterFour/0100~0199/0137.Single-Number-II.md
diff --git a/website/content/ChapterFour/0138.Copy-List-With-Random-Pointer.md b/website/content/ChapterFour/0100~0199/0138.Copy-List-With-Random-Pointer.md
similarity index 100%
rename from website/content/ChapterFour/0138.Copy-List-With-Random-Pointer.md
rename to website/content/ChapterFour/0100~0199/0138.Copy-List-With-Random-Pointer.md
diff --git a/website/content/ChapterFour/0141.Linked-List-Cycle.md b/website/content/ChapterFour/0100~0199/0141.Linked-List-Cycle.md
similarity index 100%
rename from website/content/ChapterFour/0141.Linked-List-Cycle.md
rename to website/content/ChapterFour/0100~0199/0141.Linked-List-Cycle.md
diff --git a/website/content/ChapterFour/0142.Linked-List-Cycle-II.md b/website/content/ChapterFour/0100~0199/0142.Linked-List-Cycle-II.md
similarity index 100%
rename from website/content/ChapterFour/0142.Linked-List-Cycle-II.md
rename to website/content/ChapterFour/0100~0199/0142.Linked-List-Cycle-II.md
diff --git a/website/content/ChapterFour/0143.Reorder-List.md b/website/content/ChapterFour/0100~0199/0143.Reorder-List.md
similarity index 100%
rename from website/content/ChapterFour/0143.Reorder-List.md
rename to website/content/ChapterFour/0100~0199/0143.Reorder-List.md
diff --git a/website/content/ChapterFour/0144.Binary-Tree-Preorder-Traversal.md b/website/content/ChapterFour/0100~0199/0144.Binary-Tree-Preorder-Traversal.md
similarity index 100%
rename from website/content/ChapterFour/0144.Binary-Tree-Preorder-Traversal.md
rename to website/content/ChapterFour/0100~0199/0144.Binary-Tree-Preorder-Traversal.md
diff --git a/website/content/ChapterFour/0145.Binary-Tree-Postorder-Traversal.md b/website/content/ChapterFour/0100~0199/0145.Binary-Tree-Postorder-Traversal.md
similarity index 100%
rename from website/content/ChapterFour/0145.Binary-Tree-Postorder-Traversal.md
rename to website/content/ChapterFour/0100~0199/0145.Binary-Tree-Postorder-Traversal.md
diff --git a/website/content/ChapterFour/0146.LRU-Cache.md b/website/content/ChapterFour/0100~0199/0146.LRU-Cache.md
similarity index 100%
rename from website/content/ChapterFour/0146.LRU-Cache.md
rename to website/content/ChapterFour/0100~0199/0146.LRU-Cache.md
diff --git a/website/content/ChapterFour/0147.Insertion-Sort-List.md b/website/content/ChapterFour/0100~0199/0147.Insertion-Sort-List.md
similarity index 100%
rename from website/content/ChapterFour/0147.Insertion-Sort-List.md
rename to website/content/ChapterFour/0100~0199/0147.Insertion-Sort-List.md
diff --git a/website/content/ChapterFour/0148.Sort-List.md b/website/content/ChapterFour/0100~0199/0148.Sort-List.md
similarity index 100%
rename from website/content/ChapterFour/0148.Sort-List.md
rename to website/content/ChapterFour/0100~0199/0148.Sort-List.md
diff --git a/website/content/ChapterFour/0150.Evaluate-Reverse-Polish-Notation.md b/website/content/ChapterFour/0100~0199/0150.Evaluate-Reverse-Polish-Notation.md
similarity index 100%
rename from website/content/ChapterFour/0150.Evaluate-Reverse-Polish-Notation.md
rename to website/content/ChapterFour/0100~0199/0150.Evaluate-Reverse-Polish-Notation.md
diff --git a/website/content/ChapterFour/0151.Reverse-Words-in-a-String.md b/website/content/ChapterFour/0100~0199/0151.Reverse-Words-in-a-String.md
similarity index 100%
rename from website/content/ChapterFour/0151.Reverse-Words-in-a-String.md
rename to website/content/ChapterFour/0100~0199/0151.Reverse-Words-in-a-String.md
diff --git a/website/content/ChapterFour/0152.Maximum-Product-Subarray.md b/website/content/ChapterFour/0100~0199/0152.Maximum-Product-Subarray.md
similarity index 100%
rename from website/content/ChapterFour/0152.Maximum-Product-Subarray.md
rename to website/content/ChapterFour/0100~0199/0152.Maximum-Product-Subarray.md
diff --git a/website/content/ChapterFour/0153.Find-Minimum-in-Rotated-Sorted-Array.md b/website/content/ChapterFour/0100~0199/0153.Find-Minimum-in-Rotated-Sorted-Array.md
similarity index 100%
rename from website/content/ChapterFour/0153.Find-Minimum-in-Rotated-Sorted-Array.md
rename to website/content/ChapterFour/0100~0199/0153.Find-Minimum-in-Rotated-Sorted-Array.md
diff --git a/website/content/ChapterFour/0154.Find-Minimum-in-Rotated-Sorted-Array-II.md b/website/content/ChapterFour/0100~0199/0154.Find-Minimum-in-Rotated-Sorted-Array-II.md
similarity index 100%
rename from website/content/ChapterFour/0154.Find-Minimum-in-Rotated-Sorted-Array-II.md
rename to website/content/ChapterFour/0100~0199/0154.Find-Minimum-in-Rotated-Sorted-Array-II.md
diff --git a/website/content/ChapterFour/0155.Min-Stack.md b/website/content/ChapterFour/0100~0199/0155.Min-Stack.md
similarity index 100%
rename from website/content/ChapterFour/0155.Min-Stack.md
rename to website/content/ChapterFour/0100~0199/0155.Min-Stack.md
diff --git a/website/content/ChapterFour/0160.Intersection-of-Two-Linked-Lists.md b/website/content/ChapterFour/0100~0199/0160.Intersection-of-Two-Linked-Lists.md
similarity index 100%
rename from website/content/ChapterFour/0160.Intersection-of-Two-Linked-Lists.md
rename to website/content/ChapterFour/0100~0199/0160.Intersection-of-Two-Linked-Lists.md
diff --git a/website/content/ChapterFour/0162.Find-Peak-Element.md b/website/content/ChapterFour/0100~0199/0162.Find-Peak-Element.md
similarity index 100%
rename from website/content/ChapterFour/0162.Find-Peak-Element.md
rename to website/content/ChapterFour/0100~0199/0162.Find-Peak-Element.md
diff --git a/website/content/ChapterFour/0164.Maximum-Gap.md b/website/content/ChapterFour/0100~0199/0164.Maximum-Gap.md
similarity index 100%
rename from website/content/ChapterFour/0164.Maximum-Gap.md
rename to website/content/ChapterFour/0100~0199/0164.Maximum-Gap.md
diff --git a/website/content/ChapterFour/0167.Two-Sum-II---Input-array-is-sorted.md b/website/content/ChapterFour/0100~0199/0167.Two-Sum-II---Input-array-is-sorted.md
similarity index 100%
rename from website/content/ChapterFour/0167.Two-Sum-II---Input-array-is-sorted.md
rename to website/content/ChapterFour/0100~0199/0167.Two-Sum-II---Input-array-is-sorted.md
diff --git a/website/content/ChapterFour/0168.Excel-Sheet-Column-Title.md b/website/content/ChapterFour/0100~0199/0168.Excel-Sheet-Column-Title.md
similarity index 100%
rename from website/content/ChapterFour/0168.Excel-Sheet-Column-Title.md
rename to website/content/ChapterFour/0100~0199/0168.Excel-Sheet-Column-Title.md
diff --git a/website/content/ChapterFour/0169.Majority-Element.md b/website/content/ChapterFour/0100~0199/0169.Majority-Element.md
similarity index 100%
rename from website/content/ChapterFour/0169.Majority-Element.md
rename to website/content/ChapterFour/0100~0199/0169.Majority-Element.md
diff --git a/website/content/ChapterFour/0171.Excel-Sheet-Column-Number.md b/website/content/ChapterFour/0100~0199/0171.Excel-Sheet-Column-Number.md
similarity index 100%
rename from website/content/ChapterFour/0171.Excel-Sheet-Column-Number.md
rename to website/content/ChapterFour/0100~0199/0171.Excel-Sheet-Column-Number.md
diff --git a/website/content/ChapterFour/0172.Factorial-Trailing-Zeroes.md b/website/content/ChapterFour/0100~0199/0172.Factorial-Trailing-Zeroes.md
similarity index 100%
rename from website/content/ChapterFour/0172.Factorial-Trailing-Zeroes.md
rename to website/content/ChapterFour/0100~0199/0172.Factorial-Trailing-Zeroes.md
diff --git a/website/content/ChapterFour/0173.Binary-Search-Tree-Iterator.md b/website/content/ChapterFour/0100~0199/0173.Binary-Search-Tree-Iterator.md
similarity index 100%
rename from website/content/ChapterFour/0173.Binary-Search-Tree-Iterator.md
rename to website/content/ChapterFour/0100~0199/0173.Binary-Search-Tree-Iterator.md
diff --git a/website/content/ChapterFour/0174.Dungeon-Game.md b/website/content/ChapterFour/0100~0199/0174.Dungeon-Game.md
similarity index 100%
rename from website/content/ChapterFour/0174.Dungeon-Game.md
rename to website/content/ChapterFour/0100~0199/0174.Dungeon-Game.md
diff --git a/website/content/ChapterFour/0179.Largest-Number.md b/website/content/ChapterFour/0100~0199/0179.Largest-Number.md
similarity index 100%
rename from website/content/ChapterFour/0179.Largest-Number.md
rename to website/content/ChapterFour/0100~0199/0179.Largest-Number.md
diff --git a/website/content/ChapterFour/0187.Repeated-DNA-Sequences.md b/website/content/ChapterFour/0100~0199/0187.Repeated-DNA-Sequences.md
similarity index 100%
rename from website/content/ChapterFour/0187.Repeated-DNA-Sequences.md
rename to website/content/ChapterFour/0100~0199/0187.Repeated-DNA-Sequences.md
diff --git a/website/content/ChapterFour/0189.Rotate-Array.md b/website/content/ChapterFour/0100~0199/0189.Rotate-Array.md
similarity index 100%
rename from website/content/ChapterFour/0189.Rotate-Array.md
rename to website/content/ChapterFour/0100~0199/0189.Rotate-Array.md
diff --git a/website/content/ChapterFour/0190.Reverse-Bits.md b/website/content/ChapterFour/0100~0199/0190.Reverse-Bits.md
similarity index 100%
rename from website/content/ChapterFour/0190.Reverse-Bits.md
rename to website/content/ChapterFour/0100~0199/0190.Reverse-Bits.md
diff --git a/website/content/ChapterFour/0191.Number-of-1-Bits.md b/website/content/ChapterFour/0100~0199/0191.Number-of-1-Bits.md
similarity index 100%
rename from website/content/ChapterFour/0191.Number-of-1-Bits.md
rename to website/content/ChapterFour/0100~0199/0191.Number-of-1-Bits.md
diff --git a/website/content/ChapterFour/0198.House-Robber.md b/website/content/ChapterFour/0100~0199/0198.House-Robber.md
similarity index 100%
rename from website/content/ChapterFour/0198.House-Robber.md
rename to website/content/ChapterFour/0100~0199/0198.House-Robber.md
diff --git a/website/content/ChapterFour/0199.Binary-Tree-Right-Side-View.md b/website/content/ChapterFour/0100~0199/0199.Binary-Tree-Right-Side-View.md
similarity index 100%
rename from website/content/ChapterFour/0199.Binary-Tree-Right-Side-View.md
rename to website/content/ChapterFour/0100~0199/0199.Binary-Tree-Right-Side-View.md
diff --git a/website/content/ChapterFour/0100~0199/_index.md b/website/content/ChapterFour/0100~0199/_index.md
new file mode 100644
index 000000000..d2021683f
--- /dev/null
+++ b/website/content/ChapterFour/0100~0199/_index.md
@@ -0,0 +1,5 @@
+---
+bookCollapseSection: true
+weight: 20
+---
+
diff --git a/website/content/ChapterFour/0200.Number-of-Islands.md b/website/content/ChapterFour/0200~0299/0200.Number-of-Islands.md
similarity index 100%
rename from website/content/ChapterFour/0200.Number-of-Islands.md
rename to website/content/ChapterFour/0200~0299/0200.Number-of-Islands.md
diff --git a/website/content/ChapterFour/0201.Bitwise-AND-of-Numbers-Range.md b/website/content/ChapterFour/0200~0299/0201.Bitwise-AND-of-Numbers-Range.md
similarity index 100%
rename from website/content/ChapterFour/0201.Bitwise-AND-of-Numbers-Range.md
rename to website/content/ChapterFour/0200~0299/0201.Bitwise-AND-of-Numbers-Range.md
diff --git a/website/content/ChapterFour/0202.Happy-Number.md b/website/content/ChapterFour/0200~0299/0202.Happy-Number.md
similarity index 100%
rename from website/content/ChapterFour/0202.Happy-Number.md
rename to website/content/ChapterFour/0200~0299/0202.Happy-Number.md
diff --git a/website/content/ChapterFour/0203.Remove-Linked-List-Elements.md b/website/content/ChapterFour/0200~0299/0203.Remove-Linked-List-Elements.md
similarity index 100%
rename from website/content/ChapterFour/0203.Remove-Linked-List-Elements.md
rename to website/content/ChapterFour/0200~0299/0203.Remove-Linked-List-Elements.md
diff --git a/website/content/ChapterFour/0204.Count-Primes.md b/website/content/ChapterFour/0200~0299/0204.Count-Primes.md
similarity index 100%
rename from website/content/ChapterFour/0204.Count-Primes.md
rename to website/content/ChapterFour/0200~0299/0204.Count-Primes.md
diff --git a/website/content/ChapterFour/0205.Isomorphic-Strings.md b/website/content/ChapterFour/0200~0299/0205.Isomorphic-Strings.md
similarity index 100%
rename from website/content/ChapterFour/0205.Isomorphic-Strings.md
rename to website/content/ChapterFour/0200~0299/0205.Isomorphic-Strings.md
diff --git a/website/content/ChapterFour/0206.Reverse-Linked-List.md b/website/content/ChapterFour/0200~0299/0206.Reverse-Linked-List.md
similarity index 100%
rename from website/content/ChapterFour/0206.Reverse-Linked-List.md
rename to website/content/ChapterFour/0200~0299/0206.Reverse-Linked-List.md
diff --git a/website/content/ChapterFour/0207.Course-Schedule.md b/website/content/ChapterFour/0200~0299/0207.Course-Schedule.md
similarity index 100%
rename from website/content/ChapterFour/0207.Course-Schedule.md
rename to website/content/ChapterFour/0200~0299/0207.Course-Schedule.md
diff --git a/website/content/ChapterFour/0208.Implement-Trie-Prefix-Tree.md b/website/content/ChapterFour/0200~0299/0208.Implement-Trie-Prefix-Tree.md
similarity index 100%
rename from website/content/ChapterFour/0208.Implement-Trie-Prefix-Tree.md
rename to website/content/ChapterFour/0200~0299/0208.Implement-Trie-Prefix-Tree.md
diff --git a/website/content/ChapterFour/0209.Minimum-Size-Subarray-Sum.md b/website/content/ChapterFour/0200~0299/0209.Minimum-Size-Subarray-Sum.md
similarity index 100%
rename from website/content/ChapterFour/0209.Minimum-Size-Subarray-Sum.md
rename to website/content/ChapterFour/0200~0299/0209.Minimum-Size-Subarray-Sum.md
diff --git a/website/content/ChapterFour/0210.Course-Schedule-II.md b/website/content/ChapterFour/0200~0299/0210.Course-Schedule-II.md
similarity index 100%
rename from website/content/ChapterFour/0210.Course-Schedule-II.md
rename to website/content/ChapterFour/0200~0299/0210.Course-Schedule-II.md
diff --git a/website/content/ChapterFour/0211.Design-Add-and-Search-Words-Data-Structure.md b/website/content/ChapterFour/0200~0299/0211.Design-Add-and-Search-Words-Data-Structure.md
similarity index 100%
rename from website/content/ChapterFour/0211.Design-Add-and-Search-Words-Data-Structure.md
rename to website/content/ChapterFour/0200~0299/0211.Design-Add-and-Search-Words-Data-Structure.md
diff --git a/website/content/ChapterFour/0212.Word-Search-II.md b/website/content/ChapterFour/0200~0299/0212.Word-Search-II.md
similarity index 100%
rename from website/content/ChapterFour/0212.Word-Search-II.md
rename to website/content/ChapterFour/0200~0299/0212.Word-Search-II.md
diff --git a/website/content/ChapterFour/0213.House-Robber-II.md b/website/content/ChapterFour/0200~0299/0213.House-Robber-II.md
similarity index 100%
rename from website/content/ChapterFour/0213.House-Robber-II.md
rename to website/content/ChapterFour/0200~0299/0213.House-Robber-II.md
diff --git a/website/content/ChapterFour/0215.Kth-Largest-Element-in-an-Array.md b/website/content/ChapterFour/0200~0299/0215.Kth-Largest-Element-in-an-Array.md
similarity index 100%
rename from website/content/ChapterFour/0215.Kth-Largest-Element-in-an-Array.md
rename to website/content/ChapterFour/0200~0299/0215.Kth-Largest-Element-in-an-Array.md
diff --git a/website/content/ChapterFour/0216.Combination-Sum-III.md b/website/content/ChapterFour/0200~0299/0216.Combination-Sum-III.md
similarity index 100%
rename from website/content/ChapterFour/0216.Combination-Sum-III.md
rename to website/content/ChapterFour/0200~0299/0216.Combination-Sum-III.md
diff --git a/website/content/ChapterFour/0217.Contains-Duplicate.md b/website/content/ChapterFour/0200~0299/0217.Contains-Duplicate.md
similarity index 100%
rename from website/content/ChapterFour/0217.Contains-Duplicate.md
rename to website/content/ChapterFour/0200~0299/0217.Contains-Duplicate.md
diff --git a/website/content/ChapterFour/0218.The-Skyline-Problem.md b/website/content/ChapterFour/0200~0299/0218.The-Skyline-Problem.md
similarity index 100%
rename from website/content/ChapterFour/0218.The-Skyline-Problem.md
rename to website/content/ChapterFour/0200~0299/0218.The-Skyline-Problem.md
diff --git a/website/content/ChapterFour/0219.Contains-Duplicate-II.md b/website/content/ChapterFour/0200~0299/0219.Contains-Duplicate-II.md
similarity index 100%
rename from website/content/ChapterFour/0219.Contains-Duplicate-II.md
rename to website/content/ChapterFour/0200~0299/0219.Contains-Duplicate-II.md
diff --git a/website/content/ChapterFour/0220.Contains-Duplicate-III.md b/website/content/ChapterFour/0200~0299/0220.Contains-Duplicate-III.md
similarity index 100%
rename from website/content/ChapterFour/0220.Contains-Duplicate-III.md
rename to website/content/ChapterFour/0200~0299/0220.Contains-Duplicate-III.md
diff --git a/website/content/ChapterFour/0222.Count-Complete-Tree-Nodes.md b/website/content/ChapterFour/0200~0299/0222.Count-Complete-Tree-Nodes.md
similarity index 100%
rename from website/content/ChapterFour/0222.Count-Complete-Tree-Nodes.md
rename to website/content/ChapterFour/0200~0299/0222.Count-Complete-Tree-Nodes.md
diff --git a/website/content/ChapterFour/0223.Rectangle-Area.md b/website/content/ChapterFour/0200~0299/0223.Rectangle-Area.md
similarity index 100%
rename from website/content/ChapterFour/0223.Rectangle-Area.md
rename to website/content/ChapterFour/0200~0299/0223.Rectangle-Area.md
diff --git a/website/content/ChapterFour/0224.Basic-Calculator.md b/website/content/ChapterFour/0200~0299/0224.Basic-Calculator.md
similarity index 100%
rename from website/content/ChapterFour/0224.Basic-Calculator.md
rename to website/content/ChapterFour/0200~0299/0224.Basic-Calculator.md
diff --git a/website/content/ChapterFour/0225.Implement-Stack-using-Queues.md b/website/content/ChapterFour/0200~0299/0225.Implement-Stack-using-Queues.md
similarity index 100%
rename from website/content/ChapterFour/0225.Implement-Stack-using-Queues.md
rename to website/content/ChapterFour/0200~0299/0225.Implement-Stack-using-Queues.md
diff --git a/website/content/ChapterFour/0226.Invert-Binary-Tree.md b/website/content/ChapterFour/0200~0299/0226.Invert-Binary-Tree.md
similarity index 100%
rename from website/content/ChapterFour/0226.Invert-Binary-Tree.md
rename to website/content/ChapterFour/0200~0299/0226.Invert-Binary-Tree.md
diff --git a/website/content/ChapterFour/0228.Summary-Ranges.md b/website/content/ChapterFour/0200~0299/0228.Summary-Ranges.md
similarity index 100%
rename from website/content/ChapterFour/0228.Summary-Ranges.md
rename to website/content/ChapterFour/0200~0299/0228.Summary-Ranges.md
diff --git a/website/content/ChapterFour/0229.Majority-Element-II.md b/website/content/ChapterFour/0200~0299/0229.Majority-Element-II.md
similarity index 100%
rename from website/content/ChapterFour/0229.Majority-Element-II.md
rename to website/content/ChapterFour/0200~0299/0229.Majority-Element-II.md
diff --git a/website/content/ChapterFour/0230.Kth-Smallest-Element-in-a-BST.md b/website/content/ChapterFour/0200~0299/0230.Kth-Smallest-Element-in-a-BST.md
similarity index 100%
rename from website/content/ChapterFour/0230.Kth-Smallest-Element-in-a-BST.md
rename to website/content/ChapterFour/0200~0299/0230.Kth-Smallest-Element-in-a-BST.md
diff --git a/website/content/ChapterFour/0231.Power-of-Two.md b/website/content/ChapterFour/0200~0299/0231.Power-of-Two.md
similarity index 100%
rename from website/content/ChapterFour/0231.Power-of-Two.md
rename to website/content/ChapterFour/0200~0299/0231.Power-of-Two.md
diff --git a/website/content/ChapterFour/0232.Implement-Queue-using-Stacks.md b/website/content/ChapterFour/0200~0299/0232.Implement-Queue-using-Stacks.md
similarity index 100%
rename from website/content/ChapterFour/0232.Implement-Queue-using-Stacks.md
rename to website/content/ChapterFour/0200~0299/0232.Implement-Queue-using-Stacks.md
diff --git a/website/content/ChapterFour/0234.Palindrome-Linked-List.md b/website/content/ChapterFour/0200~0299/0234.Palindrome-Linked-List.md
similarity index 100%
rename from website/content/ChapterFour/0234.Palindrome-Linked-List.md
rename to website/content/ChapterFour/0200~0299/0234.Palindrome-Linked-List.md
diff --git a/website/content/ChapterFour/0235.Lowest-Common-Ancestor-of-a-Binary-Search-Tree.md b/website/content/ChapterFour/0200~0299/0235.Lowest-Common-Ancestor-of-a-Binary-Search-Tree.md
similarity index 100%
rename from website/content/ChapterFour/0235.Lowest-Common-Ancestor-of-a-Binary-Search-Tree.md
rename to website/content/ChapterFour/0200~0299/0235.Lowest-Common-Ancestor-of-a-Binary-Search-Tree.md
diff --git a/website/content/ChapterFour/0236.Lowest-Common-Ancestor-of-a-Binary-Tree.md b/website/content/ChapterFour/0200~0299/0236.Lowest-Common-Ancestor-of-a-Binary-Tree.md
similarity index 100%
rename from website/content/ChapterFour/0236.Lowest-Common-Ancestor-of-a-Binary-Tree.md
rename to website/content/ChapterFour/0200~0299/0236.Lowest-Common-Ancestor-of-a-Binary-Tree.md
diff --git a/website/content/ChapterFour/0237.Delete-Node-in-a-Linked-List.md b/website/content/ChapterFour/0200~0299/0237.Delete-Node-in-a-Linked-List.md
similarity index 100%
rename from website/content/ChapterFour/0237.Delete-Node-in-a-Linked-List.md
rename to website/content/ChapterFour/0200~0299/0237.Delete-Node-in-a-Linked-List.md
diff --git a/website/content/ChapterFour/0239.Sliding-Window-Maximum.md b/website/content/ChapterFour/0200~0299/0239.Sliding-Window-Maximum.md
similarity index 100%
rename from website/content/ChapterFour/0239.Sliding-Window-Maximum.md
rename to website/content/ChapterFour/0200~0299/0239.Sliding-Window-Maximum.md
diff --git a/website/content/ChapterFour/0240.Search-a-2D-Matrix-II.md b/website/content/ChapterFour/0200~0299/0240.Search-a-2D-Matrix-II.md
similarity index 100%
rename from website/content/ChapterFour/0240.Search-a-2D-Matrix-II.md
rename to website/content/ChapterFour/0200~0299/0240.Search-a-2D-Matrix-II.md
diff --git a/website/content/ChapterFour/0242.Valid-Anagram.md b/website/content/ChapterFour/0200~0299/0242.Valid-Anagram.md
similarity index 100%
rename from website/content/ChapterFour/0242.Valid-Anagram.md
rename to website/content/ChapterFour/0200~0299/0242.Valid-Anagram.md
diff --git a/website/content/ChapterFour/0257.Binary-Tree-Paths.md b/website/content/ChapterFour/0200~0299/0257.Binary-Tree-Paths.md
similarity index 100%
rename from website/content/ChapterFour/0257.Binary-Tree-Paths.md
rename to website/content/ChapterFour/0200~0299/0257.Binary-Tree-Paths.md
diff --git a/website/content/ChapterFour/0258.Add-Digits.md b/website/content/ChapterFour/0200~0299/0258.Add-Digits.md
similarity index 100%
rename from website/content/ChapterFour/0258.Add-Digits.md
rename to website/content/ChapterFour/0200~0299/0258.Add-Digits.md
diff --git a/website/content/ChapterFour/0260.Single-Number-III.md b/website/content/ChapterFour/0200~0299/0260.Single-Number-III.md
similarity index 100%
rename from website/content/ChapterFour/0260.Single-Number-III.md
rename to website/content/ChapterFour/0200~0299/0260.Single-Number-III.md
diff --git a/website/content/ChapterFour/0263.Ugly-Number.md b/website/content/ChapterFour/0200~0299/0263.Ugly-Number.md
similarity index 100%
rename from website/content/ChapterFour/0263.Ugly-Number.md
rename to website/content/ChapterFour/0200~0299/0263.Ugly-Number.md
diff --git a/website/content/ChapterFour/0268.Missing-Number.md b/website/content/ChapterFour/0200~0299/0268.Missing-Number.md
similarity index 100%
rename from website/content/ChapterFour/0268.Missing-Number.md
rename to website/content/ChapterFour/0200~0299/0268.Missing-Number.md
diff --git a/website/content/ChapterFour/0274.H-Index.md b/website/content/ChapterFour/0200~0299/0274.H-Index.md
similarity index 100%
rename from website/content/ChapterFour/0274.H-Index.md
rename to website/content/ChapterFour/0200~0299/0274.H-Index.md
diff --git a/website/content/ChapterFour/0275.H-Index-II.md b/website/content/ChapterFour/0200~0299/0275.H-Index-II.md
similarity index 100%
rename from website/content/ChapterFour/0275.H-Index-II.md
rename to website/content/ChapterFour/0200~0299/0275.H-Index-II.md
diff --git a/website/content/ChapterFour/0283.Move-Zeroes.md b/website/content/ChapterFour/0200~0299/0283.Move-Zeroes.md
similarity index 100%
rename from website/content/ChapterFour/0283.Move-Zeroes.md
rename to website/content/ChapterFour/0200~0299/0283.Move-Zeroes.md
diff --git a/website/content/ChapterFour/0287.Find-the-Duplicate-Number.md b/website/content/ChapterFour/0200~0299/0287.Find-the-Duplicate-Number.md
similarity index 100%
rename from website/content/ChapterFour/0287.Find-the-Duplicate-Number.md
rename to website/content/ChapterFour/0200~0299/0287.Find-the-Duplicate-Number.md
diff --git a/website/content/ChapterFour/0290.Word-Pattern.md b/website/content/ChapterFour/0200~0299/0290.Word-Pattern.md
similarity index 100%
rename from website/content/ChapterFour/0290.Word-Pattern.md
rename to website/content/ChapterFour/0200~0299/0290.Word-Pattern.md
diff --git a/website/content/ChapterFour/0200~0299/_index.md b/website/content/ChapterFour/0200~0299/_index.md
new file mode 100644
index 000000000..d2021683f
--- /dev/null
+++ b/website/content/ChapterFour/0200~0299/_index.md
@@ -0,0 +1,5 @@
+---
+bookCollapseSection: true
+weight: 20
+---
+
diff --git a/website/content/ChapterFour/0300.Longest-Increasing-Subsequence.md b/website/content/ChapterFour/0300~0399/0300.Longest-Increasing-Subsequence.md
similarity index 100%
rename from website/content/ChapterFour/0300.Longest-Increasing-Subsequence.md
rename to website/content/ChapterFour/0300~0399/0300.Longest-Increasing-Subsequence.md
diff --git a/website/content/ChapterFour/0303.Range-Sum-Query---Immutable.md b/website/content/ChapterFour/0300~0399/0303.Range-Sum-Query---Immutable.md
similarity index 100%
rename from website/content/ChapterFour/0303.Range-Sum-Query---Immutable.md
rename to website/content/ChapterFour/0300~0399/0303.Range-Sum-Query---Immutable.md
diff --git a/website/content/ChapterFour/0306.Additive-Number.md b/website/content/ChapterFour/0300~0399/0306.Additive-Number.md
similarity index 100%
rename from website/content/ChapterFour/0306.Additive-Number.md
rename to website/content/ChapterFour/0300~0399/0306.Additive-Number.md
diff --git a/website/content/ChapterFour/0307.Range-Sum-Query---Mutable.md b/website/content/ChapterFour/0300~0399/0307.Range-Sum-Query---Mutable.md
similarity index 100%
rename from website/content/ChapterFour/0307.Range-Sum-Query---Mutable.md
rename to website/content/ChapterFour/0300~0399/0307.Range-Sum-Query---Mutable.md
diff --git a/website/content/ChapterFour/0309.Best-Time-to-Buy-and-Sell-Stock-with-Cooldown.md b/website/content/ChapterFour/0300~0399/0309.Best-Time-to-Buy-and-Sell-Stock-with-Cooldown.md
similarity index 100%
rename from website/content/ChapterFour/0309.Best-Time-to-Buy-and-Sell-Stock-with-Cooldown.md
rename to website/content/ChapterFour/0300~0399/0309.Best-Time-to-Buy-and-Sell-Stock-with-Cooldown.md
diff --git a/website/content/ChapterFour/0315.Count-of-Smaller-Numbers-After-Self.md b/website/content/ChapterFour/0300~0399/0315.Count-of-Smaller-Numbers-After-Self.md
similarity index 100%
rename from website/content/ChapterFour/0315.Count-of-Smaller-Numbers-After-Self.md
rename to website/content/ChapterFour/0300~0399/0315.Count-of-Smaller-Numbers-After-Self.md
diff --git a/website/content/ChapterFour/0318.Maximum-Product-of-Word-Lengths.md b/website/content/ChapterFour/0300~0399/0318.Maximum-Product-of-Word-Lengths.md
similarity index 100%
rename from website/content/ChapterFour/0318.Maximum-Product-of-Word-Lengths.md
rename to website/content/ChapterFour/0300~0399/0318.Maximum-Product-of-Word-Lengths.md
diff --git a/website/content/ChapterFour/0322.Coin-Change.md b/website/content/ChapterFour/0300~0399/0322.Coin-Change.md
similarity index 100%
rename from website/content/ChapterFour/0322.Coin-Change.md
rename to website/content/ChapterFour/0300~0399/0322.Coin-Change.md
diff --git a/website/content/ChapterFour/0324.Wiggle-Sort-II.md b/website/content/ChapterFour/0300~0399/0324.Wiggle-Sort-II.md
similarity index 100%
rename from website/content/ChapterFour/0324.Wiggle-Sort-II.md
rename to website/content/ChapterFour/0300~0399/0324.Wiggle-Sort-II.md
diff --git a/website/content/ChapterFour/0326.Power-of-Three.md b/website/content/ChapterFour/0300~0399/0326.Power-of-Three.md
similarity index 100%
rename from website/content/ChapterFour/0326.Power-of-Three.md
rename to website/content/ChapterFour/0300~0399/0326.Power-of-Three.md
diff --git a/website/content/ChapterFour/0327.Count-of-Range-Sum.md b/website/content/ChapterFour/0300~0399/0327.Count-of-Range-Sum.md
similarity index 100%
rename from website/content/ChapterFour/0327.Count-of-Range-Sum.md
rename to website/content/ChapterFour/0300~0399/0327.Count-of-Range-Sum.md
diff --git a/website/content/ChapterFour/0328.Odd-Even-Linked-List.md b/website/content/ChapterFour/0300~0399/0328.Odd-Even-Linked-List.md
similarity index 100%
rename from website/content/ChapterFour/0328.Odd-Even-Linked-List.md
rename to website/content/ChapterFour/0300~0399/0328.Odd-Even-Linked-List.md
diff --git a/website/content/ChapterFour/0329.Longest-Increasing-Path-in-a-Matrix.md b/website/content/ChapterFour/0300~0399/0329.Longest-Increasing-Path-in-a-Matrix.md
similarity index 100%
rename from website/content/ChapterFour/0329.Longest-Increasing-Path-in-a-Matrix.md
rename to website/content/ChapterFour/0300~0399/0329.Longest-Increasing-Path-in-a-Matrix.md
diff --git a/website/content/ChapterFour/0331.Verify-Preorder-Serialization-of-a-Binary-Tree.md b/website/content/ChapterFour/0300~0399/0331.Verify-Preorder-Serialization-of-a-Binary-Tree.md
similarity index 100%
rename from website/content/ChapterFour/0331.Verify-Preorder-Serialization-of-a-Binary-Tree.md
rename to website/content/ChapterFour/0300~0399/0331.Verify-Preorder-Serialization-of-a-Binary-Tree.md
diff --git a/website/content/ChapterFour/0337.House-Robber-III.md b/website/content/ChapterFour/0300~0399/0337.House-Robber-III.md
similarity index 100%
rename from website/content/ChapterFour/0337.House-Robber-III.md
rename to website/content/ChapterFour/0300~0399/0337.House-Robber-III.md
diff --git a/website/content/ChapterFour/0338.Counting-Bits.md b/website/content/ChapterFour/0300~0399/0338.Counting-Bits.md
similarity index 100%
rename from website/content/ChapterFour/0338.Counting-Bits.md
rename to website/content/ChapterFour/0300~0399/0338.Counting-Bits.md
diff --git a/website/content/ChapterFour/0342.Power-of-Four.md b/website/content/ChapterFour/0300~0399/0342.Power-of-Four.md
similarity index 100%
rename from website/content/ChapterFour/0342.Power-of-Four.md
rename to website/content/ChapterFour/0300~0399/0342.Power-of-Four.md
diff --git a/website/content/ChapterFour/0343.Integer-Break.md b/website/content/ChapterFour/0300~0399/0343.Integer-Break.md
similarity index 100%
rename from website/content/ChapterFour/0343.Integer-Break.md
rename to website/content/ChapterFour/0300~0399/0343.Integer-Break.md
diff --git a/website/content/ChapterFour/0344.Reverse-String.md b/website/content/ChapterFour/0300~0399/0344.Reverse-String.md
similarity index 100%
rename from website/content/ChapterFour/0344.Reverse-String.md
rename to website/content/ChapterFour/0300~0399/0344.Reverse-String.md
diff --git a/website/content/ChapterFour/0345.Reverse-Vowels-of-a-String.md b/website/content/ChapterFour/0300~0399/0345.Reverse-Vowels-of-a-String.md
similarity index 100%
rename from website/content/ChapterFour/0345.Reverse-Vowels-of-a-String.md
rename to website/content/ChapterFour/0300~0399/0345.Reverse-Vowels-of-a-String.md
diff --git a/website/content/ChapterFour/0347.Top-K-Frequent-Elements.md b/website/content/ChapterFour/0300~0399/0347.Top-K-Frequent-Elements.md
similarity index 100%
rename from website/content/ChapterFour/0347.Top-K-Frequent-Elements.md
rename to website/content/ChapterFour/0300~0399/0347.Top-K-Frequent-Elements.md
diff --git a/website/content/ChapterFour/0349.Intersection-of-Two-Arrays.md b/website/content/ChapterFour/0300~0399/0349.Intersection-of-Two-Arrays.md
similarity index 100%
rename from website/content/ChapterFour/0349.Intersection-of-Two-Arrays.md
rename to website/content/ChapterFour/0300~0399/0349.Intersection-of-Two-Arrays.md
diff --git a/website/content/ChapterFour/0350.Intersection-of-Two-Arrays-II.md b/website/content/ChapterFour/0300~0399/0350.Intersection-of-Two-Arrays-II.md
similarity index 100%
rename from website/content/ChapterFour/0350.Intersection-of-Two-Arrays-II.md
rename to website/content/ChapterFour/0300~0399/0350.Intersection-of-Two-Arrays-II.md
diff --git a/website/content/ChapterFour/0354.Russian-Doll-Envelopes.md b/website/content/ChapterFour/0300~0399/0354.Russian-Doll-Envelopes.md
similarity index 100%
rename from website/content/ChapterFour/0354.Russian-Doll-Envelopes.md
rename to website/content/ChapterFour/0300~0399/0354.Russian-Doll-Envelopes.md
diff --git a/website/content/ChapterFour/0357.Count-Numbers-with-Unique-Digits.md b/website/content/ChapterFour/0300~0399/0357.Count-Numbers-with-Unique-Digits.md
similarity index 100%
rename from website/content/ChapterFour/0357.Count-Numbers-with-Unique-Digits.md
rename to website/content/ChapterFour/0300~0399/0357.Count-Numbers-with-Unique-Digits.md
diff --git a/website/content/ChapterFour/0367.Valid-Perfect-Square.md b/website/content/ChapterFour/0300~0399/0367.Valid-Perfect-Square.md
similarity index 100%
rename from website/content/ChapterFour/0367.Valid-Perfect-Square.md
rename to website/content/ChapterFour/0300~0399/0367.Valid-Perfect-Square.md
diff --git a/website/content/ChapterFour/0371.Sum-of-Two-Integers.md b/website/content/ChapterFour/0300~0399/0371.Sum-of-Two-Integers.md
similarity index 100%
rename from website/content/ChapterFour/0371.Sum-of-Two-Integers.md
rename to website/content/ChapterFour/0300~0399/0371.Sum-of-Two-Integers.md
diff --git a/website/content/ChapterFour/0372.Super-Pow.md b/website/content/ChapterFour/0300~0399/0372.Super-Pow.md
similarity index 100%
rename from website/content/ChapterFour/0372.Super-Pow.md
rename to website/content/ChapterFour/0300~0399/0372.Super-Pow.md
diff --git a/website/content/ChapterFour/0373.Find-K-Pairs-with-Smallest-Sums.md b/website/content/ChapterFour/0300~0399/0373.Find-K-Pairs-with-Smallest-Sums.md
similarity index 100%
rename from website/content/ChapterFour/0373.Find-K-Pairs-with-Smallest-Sums.md
rename to website/content/ChapterFour/0300~0399/0373.Find-K-Pairs-with-Smallest-Sums.md
diff --git a/website/content/ChapterFour/0378.Kth-Smallest-Element-in-a-Sorted-Matrix.md b/website/content/ChapterFour/0300~0399/0378.Kth-Smallest-Element-in-a-Sorted-Matrix.md
similarity index 100%
rename from website/content/ChapterFour/0378.Kth-Smallest-Element-in-a-Sorted-Matrix.md
rename to website/content/ChapterFour/0300~0399/0378.Kth-Smallest-Element-in-a-Sorted-Matrix.md
diff --git a/website/content/ChapterFour/0385.Mini-Parser.md b/website/content/ChapterFour/0300~0399/0385.Mini-Parser.md
similarity index 100%
rename from website/content/ChapterFour/0385.Mini-Parser.md
rename to website/content/ChapterFour/0300~0399/0385.Mini-Parser.md
diff --git a/website/content/ChapterFour/0386.Lexicographical-Numbers.md b/website/content/ChapterFour/0300~0399/0386.Lexicographical-Numbers.md
similarity index 100%
rename from website/content/ChapterFour/0386.Lexicographical-Numbers.md
rename to website/content/ChapterFour/0300~0399/0386.Lexicographical-Numbers.md
diff --git a/website/content/ChapterFour/0387.First-Unique-Character-in-a-String.md b/website/content/ChapterFour/0300~0399/0387.First-Unique-Character-in-a-String.md
similarity index 100%
rename from website/content/ChapterFour/0387.First-Unique-Character-in-a-String.md
rename to website/content/ChapterFour/0300~0399/0387.First-Unique-Character-in-a-String.md
diff --git a/website/content/ChapterFour/0389.Find-the-Difference.md b/website/content/ChapterFour/0300~0399/0389.Find-the-Difference.md
similarity index 100%
rename from website/content/ChapterFour/0389.Find-the-Difference.md
rename to website/content/ChapterFour/0300~0399/0389.Find-the-Difference.md
diff --git a/website/content/ChapterFour/0392.Is-Subsequence.md b/website/content/ChapterFour/0300~0399/0392.Is-Subsequence.md
similarity index 100%
rename from website/content/ChapterFour/0392.Is-Subsequence.md
rename to website/content/ChapterFour/0300~0399/0392.Is-Subsequence.md
diff --git a/website/content/ChapterFour/0393.UTF-8-Validation.md b/website/content/ChapterFour/0300~0399/0393.UTF-8-Validation.md
similarity index 100%
rename from website/content/ChapterFour/0393.UTF-8-Validation.md
rename to website/content/ChapterFour/0300~0399/0393.UTF-8-Validation.md
diff --git a/website/content/ChapterFour/0394.Decode-String.md b/website/content/ChapterFour/0300~0399/0394.Decode-String.md
similarity index 100%
rename from website/content/ChapterFour/0394.Decode-String.md
rename to website/content/ChapterFour/0300~0399/0394.Decode-String.md
diff --git a/website/content/ChapterFour/0397.Integer-Replacement.md b/website/content/ChapterFour/0300~0399/0397.Integer-Replacement.md
similarity index 100%
rename from website/content/ChapterFour/0397.Integer-Replacement.md
rename to website/content/ChapterFour/0300~0399/0397.Integer-Replacement.md
diff --git a/website/content/ChapterFour/0399.Evaluate-Division.md b/website/content/ChapterFour/0300~0399/0399.Evaluate-Division.md
similarity index 100%
rename from website/content/ChapterFour/0399.Evaluate-Division.md
rename to website/content/ChapterFour/0300~0399/0399.Evaluate-Division.md
diff --git a/website/content/ChapterFour/0300~0399/_index.md b/website/content/ChapterFour/0300~0399/_index.md
new file mode 100644
index 000000000..d2021683f
--- /dev/null
+++ b/website/content/ChapterFour/0300~0399/_index.md
@@ -0,0 +1,5 @@
+---
+bookCollapseSection: true
+weight: 20
+---
+
diff --git a/website/content/ChapterFour/0401.Binary-Watch.md b/website/content/ChapterFour/0400~0499/0401.Binary-Watch.md
similarity index 100%
rename from website/content/ChapterFour/0401.Binary-Watch.md
rename to website/content/ChapterFour/0400~0499/0401.Binary-Watch.md
diff --git a/website/content/ChapterFour/0402.Remove-K-Digits.md b/website/content/ChapterFour/0400~0499/0402.Remove-K-Digits.md
similarity index 100%
rename from website/content/ChapterFour/0402.Remove-K-Digits.md
rename to website/content/ChapterFour/0400~0499/0402.Remove-K-Digits.md
diff --git a/website/content/ChapterFour/0404.Sum-of-Left-Leaves.md b/website/content/ChapterFour/0400~0499/0404.Sum-of-Left-Leaves.md
similarity index 100%
rename from website/content/ChapterFour/0404.Sum-of-Left-Leaves.md
rename to website/content/ChapterFour/0400~0499/0404.Sum-of-Left-Leaves.md
diff --git a/website/content/ChapterFour/0405.Convert-a-Number-to-Hexadecimal.md b/website/content/ChapterFour/0400~0499/0405.Convert-a-Number-to-Hexadecimal.md
similarity index 100%
rename from website/content/ChapterFour/0405.Convert-a-Number-to-Hexadecimal.md
rename to website/content/ChapterFour/0400~0499/0405.Convert-a-Number-to-Hexadecimal.md
diff --git a/website/content/ChapterFour/0409.Longest-Palindrome.md b/website/content/ChapterFour/0400~0499/0409.Longest-Palindrome.md
similarity index 100%
rename from website/content/ChapterFour/0409.Longest-Palindrome.md
rename to website/content/ChapterFour/0400~0499/0409.Longest-Palindrome.md
diff --git a/website/content/ChapterFour/0410.Split-Array-Largest-Sum.md b/website/content/ChapterFour/0400~0499/0410.Split-Array-Largest-Sum.md
similarity index 100%
rename from website/content/ChapterFour/0410.Split-Array-Largest-Sum.md
rename to website/content/ChapterFour/0400~0499/0410.Split-Array-Largest-Sum.md
diff --git a/website/content/ChapterFour/0412.Fizz-Buzz.md b/website/content/ChapterFour/0400~0499/0412.Fizz-Buzz.md
similarity index 100%
rename from website/content/ChapterFour/0412.Fizz-Buzz.md
rename to website/content/ChapterFour/0400~0499/0412.Fizz-Buzz.md
diff --git a/website/content/ChapterFour/0414.Third-Maximum-Number.md b/website/content/ChapterFour/0400~0499/0414.Third-Maximum-Number.md
similarity index 100%
rename from website/content/ChapterFour/0414.Third-Maximum-Number.md
rename to website/content/ChapterFour/0400~0499/0414.Third-Maximum-Number.md
diff --git a/website/content/ChapterFour/0416.Partition-Equal-Subset-Sum.md b/website/content/ChapterFour/0400~0499/0416.Partition-Equal-Subset-Sum.md
similarity index 100%
rename from website/content/ChapterFour/0416.Partition-Equal-Subset-Sum.md
rename to website/content/ChapterFour/0400~0499/0416.Partition-Equal-Subset-Sum.md
diff --git a/website/content/ChapterFour/0421.Maximum-XOR-of-Two-Numbers-in-an-Array.md b/website/content/ChapterFour/0400~0499/0421.Maximum-XOR-of-Two-Numbers-in-an-Array.md
similarity index 100%
rename from website/content/ChapterFour/0421.Maximum-XOR-of-Two-Numbers-in-an-Array.md
rename to website/content/ChapterFour/0400~0499/0421.Maximum-XOR-of-Two-Numbers-in-an-Array.md
diff --git a/website/content/ChapterFour/0424.Longest-Repeating-Character-Replacement.md b/website/content/ChapterFour/0400~0499/0424.Longest-Repeating-Character-Replacement.md
similarity index 100%
rename from website/content/ChapterFour/0424.Longest-Repeating-Character-Replacement.md
rename to website/content/ChapterFour/0400~0499/0424.Longest-Repeating-Character-Replacement.md
diff --git a/website/content/ChapterFour/0433.Minimum-Genetic-Mutation.md b/website/content/ChapterFour/0400~0499/0433.Minimum-Genetic-Mutation.md
similarity index 100%
rename from website/content/ChapterFour/0433.Minimum-Genetic-Mutation.md
rename to website/content/ChapterFour/0400~0499/0433.Minimum-Genetic-Mutation.md
diff --git a/website/content/ChapterFour/0435.Non-overlapping-Intervals.md b/website/content/ChapterFour/0400~0499/0435.Non-overlapping-Intervals.md
similarity index 100%
rename from website/content/ChapterFour/0435.Non-overlapping-Intervals.md
rename to website/content/ChapterFour/0400~0499/0435.Non-overlapping-Intervals.md
diff --git a/website/content/ChapterFour/0436.Find-Right-Interval.md b/website/content/ChapterFour/0400~0499/0436.Find-Right-Interval.md
similarity index 100%
rename from website/content/ChapterFour/0436.Find-Right-Interval.md
rename to website/content/ChapterFour/0400~0499/0436.Find-Right-Interval.md
diff --git a/website/content/ChapterFour/0437.Path-Sum-III.md b/website/content/ChapterFour/0400~0499/0437.Path-Sum-III.md
similarity index 100%
rename from website/content/ChapterFour/0437.Path-Sum-III.md
rename to website/content/ChapterFour/0400~0499/0437.Path-Sum-III.md
diff --git a/website/content/ChapterFour/0438.Find-All-Anagrams-in-a-String.md b/website/content/ChapterFour/0400~0499/0438.Find-All-Anagrams-in-a-String.md
similarity index 100%
rename from website/content/ChapterFour/0438.Find-All-Anagrams-in-a-String.md
rename to website/content/ChapterFour/0400~0499/0438.Find-All-Anagrams-in-a-String.md
diff --git a/website/content/ChapterFour/0441.Arranging-Coins.md b/website/content/ChapterFour/0400~0499/0441.Arranging-Coins.md
similarity index 100%
rename from website/content/ChapterFour/0441.Arranging-Coins.md
rename to website/content/ChapterFour/0400~0499/0441.Arranging-Coins.md
diff --git a/website/content/ChapterFour/0445.Add-Two-Numbers-II.md b/website/content/ChapterFour/0400~0499/0445.Add-Two-Numbers-II.md
similarity index 100%
rename from website/content/ChapterFour/0445.Add-Two-Numbers-II.md
rename to website/content/ChapterFour/0400~0499/0445.Add-Two-Numbers-II.md
diff --git a/website/content/ChapterFour/0447.Number-of-Boomerangs.md b/website/content/ChapterFour/0400~0499/0447.Number-of-Boomerangs.md
similarity index 100%
rename from website/content/ChapterFour/0447.Number-of-Boomerangs.md
rename to website/content/ChapterFour/0400~0499/0447.Number-of-Boomerangs.md
diff --git a/website/content/ChapterFour/0448.Find-All-Numbers-Disappeared-in-an-Array.md b/website/content/ChapterFour/0400~0499/0448.Find-All-Numbers-Disappeared-in-an-Array.md
similarity index 100%
rename from website/content/ChapterFour/0448.Find-All-Numbers-Disappeared-in-an-Array.md
rename to website/content/ChapterFour/0400~0499/0448.Find-All-Numbers-Disappeared-in-an-Array.md
diff --git a/website/content/ChapterFour/0451.Sort-Characters-By-Frequency.md b/website/content/ChapterFour/0400~0499/0451.Sort-Characters-By-Frequency.md
similarity index 100%
rename from website/content/ChapterFour/0451.Sort-Characters-By-Frequency.md
rename to website/content/ChapterFour/0400~0499/0451.Sort-Characters-By-Frequency.md
diff --git a/website/content/ChapterFour/0453.Minimum-Moves-to-Equal-Array-Elements.md b/website/content/ChapterFour/0400~0499/0453.Minimum-Moves-to-Equal-Array-Elements.md
similarity index 100%
rename from website/content/ChapterFour/0453.Minimum-Moves-to-Equal-Array-Elements.md
rename to website/content/ChapterFour/0400~0499/0453.Minimum-Moves-to-Equal-Array-Elements.md
diff --git a/website/content/ChapterFour/0454.4Sum-II.md b/website/content/ChapterFour/0400~0499/0454.4Sum-II.md
similarity index 100%
rename from website/content/ChapterFour/0454.4Sum-II.md
rename to website/content/ChapterFour/0400~0499/0454.4Sum-II.md
diff --git a/website/content/ChapterFour/0455.Assign-Cookies.md b/website/content/ChapterFour/0400~0499/0455.Assign-Cookies.md
similarity index 100%
rename from website/content/ChapterFour/0455.Assign-Cookies.md
rename to website/content/ChapterFour/0400~0499/0455.Assign-Cookies.md
diff --git a/website/content/ChapterFour/0456.132-Pattern.md b/website/content/ChapterFour/0400~0499/0456.132-Pattern.md
similarity index 100%
rename from website/content/ChapterFour/0456.132-Pattern.md
rename to website/content/ChapterFour/0400~0499/0456.132-Pattern.md
diff --git a/website/content/ChapterFour/0457.Circular-Array-Loop.md b/website/content/ChapterFour/0400~0499/0457.Circular-Array-Loop.md
similarity index 100%
rename from website/content/ChapterFour/0457.Circular-Array-Loop.md
rename to website/content/ChapterFour/0400~0499/0457.Circular-Array-Loop.md
diff --git a/website/content/ChapterFour/0460.LFU-Cache.md b/website/content/ChapterFour/0400~0499/0460.LFU-Cache.md
similarity index 100%
rename from website/content/ChapterFour/0460.LFU-Cache.md
rename to website/content/ChapterFour/0400~0499/0460.LFU-Cache.md
diff --git a/website/content/ChapterFour/0461.Hamming-Distance.md b/website/content/ChapterFour/0400~0499/0461.Hamming-Distance.md
similarity index 100%
rename from website/content/ChapterFour/0461.Hamming-Distance.md
rename to website/content/ChapterFour/0400~0499/0461.Hamming-Distance.md
diff --git a/website/content/ChapterFour/0463.Island-Perimeter.md b/website/content/ChapterFour/0400~0499/0463.Island-Perimeter.md
similarity index 100%
rename from website/content/ChapterFour/0463.Island-Perimeter.md
rename to website/content/ChapterFour/0400~0499/0463.Island-Perimeter.md
diff --git a/website/content/ChapterFour/0470.Implement-Rand10-Using-Rand7.md b/website/content/ChapterFour/0400~0499/0470.Implement-Rand10-Using-Rand7.md
similarity index 100%
rename from website/content/ChapterFour/0470.Implement-Rand10-Using-Rand7.md
rename to website/content/ChapterFour/0400~0499/0470.Implement-Rand10-Using-Rand7.md
diff --git a/website/content/ChapterFour/0474.Ones-and-Zeroes.md b/website/content/ChapterFour/0400~0499/0474.Ones-and-Zeroes.md
similarity index 100%
rename from website/content/ChapterFour/0474.Ones-and-Zeroes.md
rename to website/content/ChapterFour/0400~0499/0474.Ones-and-Zeroes.md
diff --git a/website/content/ChapterFour/0475.Heaters.md b/website/content/ChapterFour/0400~0499/0475.Heaters.md
similarity index 100%
rename from website/content/ChapterFour/0475.Heaters.md
rename to website/content/ChapterFour/0400~0499/0475.Heaters.md
diff --git a/website/content/ChapterFour/0476.Number-Complement.md b/website/content/ChapterFour/0400~0499/0476.Number-Complement.md
similarity index 100%
rename from website/content/ChapterFour/0476.Number-Complement.md
rename to website/content/ChapterFour/0400~0499/0476.Number-Complement.md
diff --git a/website/content/ChapterFour/0477.Total-Hamming-Distance.md b/website/content/ChapterFour/0400~0499/0477.Total-Hamming-Distance.md
similarity index 100%
rename from website/content/ChapterFour/0477.Total-Hamming-Distance.md
rename to website/content/ChapterFour/0400~0499/0477.Total-Hamming-Distance.md
diff --git a/website/content/ChapterFour/0480.Sliding-Window-Median.md b/website/content/ChapterFour/0400~0499/0480.Sliding-Window-Median.md
similarity index 100%
rename from website/content/ChapterFour/0480.Sliding-Window-Median.md
rename to website/content/ChapterFour/0400~0499/0480.Sliding-Window-Median.md
diff --git a/website/content/ChapterFour/0483.Smallest-Good-Base.md b/website/content/ChapterFour/0400~0499/0483.Smallest-Good-Base.md
similarity index 100%
rename from website/content/ChapterFour/0483.Smallest-Good-Base.md
rename to website/content/ChapterFour/0400~0499/0483.Smallest-Good-Base.md
diff --git a/website/content/ChapterFour/0485.Max-Consecutive-Ones.md b/website/content/ChapterFour/0400~0499/0485.Max-Consecutive-Ones.md
similarity index 100%
rename from website/content/ChapterFour/0485.Max-Consecutive-Ones.md
rename to website/content/ChapterFour/0400~0499/0485.Max-Consecutive-Ones.md
diff --git a/website/content/ChapterFour/0491.Increasing-Subsequences.md b/website/content/ChapterFour/0400~0499/0491.Increasing-Subsequences.md
similarity index 100%
rename from website/content/ChapterFour/0491.Increasing-Subsequences.md
rename to website/content/ChapterFour/0400~0499/0491.Increasing-Subsequences.md
diff --git a/website/content/ChapterFour/0493.Reverse-Pairs.md b/website/content/ChapterFour/0400~0499/0493.Reverse-Pairs.md
similarity index 100%
rename from website/content/ChapterFour/0493.Reverse-Pairs.md
rename to website/content/ChapterFour/0400~0499/0493.Reverse-Pairs.md
diff --git a/website/content/ChapterFour/0494.Target-Sum.md b/website/content/ChapterFour/0400~0499/0494.Target-Sum.md
similarity index 100%
rename from website/content/ChapterFour/0494.Target-Sum.md
rename to website/content/ChapterFour/0400~0499/0494.Target-Sum.md
diff --git a/website/content/ChapterFour/0496.Next-Greater-Element-I.md b/website/content/ChapterFour/0400~0499/0496.Next-Greater-Element-I.md
similarity index 100%
rename from website/content/ChapterFour/0496.Next-Greater-Element-I.md
rename to website/content/ChapterFour/0400~0499/0496.Next-Greater-Element-I.md
diff --git a/website/content/ChapterFour/0497.Random-Point-in-Non-overlapping-Rectangles.md b/website/content/ChapterFour/0400~0499/0497.Random-Point-in-Non-overlapping-Rectangles.md
similarity index 100%
rename from website/content/ChapterFour/0497.Random-Point-in-Non-overlapping-Rectangles.md
rename to website/content/ChapterFour/0400~0499/0497.Random-Point-in-Non-overlapping-Rectangles.md
diff --git a/website/content/ChapterFour/0498.Diagonal-Traverse.md b/website/content/ChapterFour/0400~0499/0498.Diagonal-Traverse.md
similarity index 100%
rename from website/content/ChapterFour/0498.Diagonal-Traverse.md
rename to website/content/ChapterFour/0400~0499/0498.Diagonal-Traverse.md
diff --git a/website/content/ChapterFour/0400~0499/_index.md b/website/content/ChapterFour/0400~0499/_index.md
new file mode 100644
index 000000000..d2021683f
--- /dev/null
+++ b/website/content/ChapterFour/0400~0499/_index.md
@@ -0,0 +1,5 @@
+---
+bookCollapseSection: true
+weight: 20
+---
+
diff --git a/website/content/ChapterFour/0500.Keyboard-Row.md b/website/content/ChapterFour/0500~0599/0500.Keyboard-Row.md
similarity index 100%
rename from website/content/ChapterFour/0500.Keyboard-Row.md
rename to website/content/ChapterFour/0500~0599/0500.Keyboard-Row.md
diff --git a/website/content/ChapterFour/0503.Next-Greater-Element-II.md b/website/content/ChapterFour/0500~0599/0503.Next-Greater-Element-II.md
similarity index 100%
rename from website/content/ChapterFour/0503.Next-Greater-Element-II.md
rename to website/content/ChapterFour/0500~0599/0503.Next-Greater-Element-II.md
diff --git a/website/content/ChapterFour/0507.Perfect-Number.md b/website/content/ChapterFour/0500~0599/0507.Perfect-Number.md
similarity index 100%
rename from website/content/ChapterFour/0507.Perfect-Number.md
rename to website/content/ChapterFour/0500~0599/0507.Perfect-Number.md
diff --git a/website/content/ChapterFour/0508.Most-Frequent-Subtree-Sum.md b/website/content/ChapterFour/0500~0599/0508.Most-Frequent-Subtree-Sum.md
similarity index 100%
rename from website/content/ChapterFour/0508.Most-Frequent-Subtree-Sum.md
rename to website/content/ChapterFour/0500~0599/0508.Most-Frequent-Subtree-Sum.md
diff --git a/website/content/ChapterFour/0509.Fibonacci-Number.md b/website/content/ChapterFour/0500~0599/0509.Fibonacci-Number.md
similarity index 100%
rename from website/content/ChapterFour/0509.Fibonacci-Number.md
rename to website/content/ChapterFour/0500~0599/0509.Fibonacci-Number.md
diff --git a/website/content/ChapterFour/0513.Find-Bottom-Left-Tree-Value.md b/website/content/ChapterFour/0500~0599/0513.Find-Bottom-Left-Tree-Value.md
similarity index 100%
rename from website/content/ChapterFour/0513.Find-Bottom-Left-Tree-Value.md
rename to website/content/ChapterFour/0500~0599/0513.Find-Bottom-Left-Tree-Value.md
diff --git a/website/content/ChapterFour/0515.Find-Largest-Value-in-Each-Tree-Row.md b/website/content/ChapterFour/0500~0599/0515.Find-Largest-Value-in-Each-Tree-Row.md
similarity index 100%
rename from website/content/ChapterFour/0515.Find-Largest-Value-in-Each-Tree-Row.md
rename to website/content/ChapterFour/0500~0599/0515.Find-Largest-Value-in-Each-Tree-Row.md
diff --git a/website/content/ChapterFour/0524.Longest-Word-in-Dictionary-through-Deleting.md b/website/content/ChapterFour/0500~0599/0524.Longest-Word-in-Dictionary-through-Deleting.md
similarity index 100%
rename from website/content/ChapterFour/0524.Longest-Word-in-Dictionary-through-Deleting.md
rename to website/content/ChapterFour/0500~0599/0524.Longest-Word-in-Dictionary-through-Deleting.md
diff --git a/website/content/ChapterFour/0526.Beautiful-Arrangement.md b/website/content/ChapterFour/0500~0599/0526.Beautiful-Arrangement.md
similarity index 100%
rename from website/content/ChapterFour/0526.Beautiful-Arrangement.md
rename to website/content/ChapterFour/0500~0599/0526.Beautiful-Arrangement.md
diff --git a/website/content/ChapterFour/0528.Random-Pick-with-Weight.md b/website/content/ChapterFour/0500~0599/0528.Random-Pick-with-Weight.md
similarity index 100%
rename from website/content/ChapterFour/0528.Random-Pick-with-Weight.md
rename to website/content/ChapterFour/0500~0599/0528.Random-Pick-with-Weight.md
diff --git a/website/content/ChapterFour/0529.Minesweeper.md b/website/content/ChapterFour/0500~0599/0529.Minesweeper.md
similarity index 100%
rename from website/content/ChapterFour/0529.Minesweeper.md
rename to website/content/ChapterFour/0500~0599/0529.Minesweeper.md
diff --git a/website/content/ChapterFour/0532.K-diff-Pairs-in-an-Array.md b/website/content/ChapterFour/0500~0599/0532.K-diff-Pairs-in-an-Array.md
similarity index 100%
rename from website/content/ChapterFour/0532.K-diff-Pairs-in-an-Array.md
rename to website/content/ChapterFour/0500~0599/0532.K-diff-Pairs-in-an-Array.md
diff --git a/website/content/ChapterFour/0537.Complex-Number-Multiplication.md b/website/content/ChapterFour/0500~0599/0537.Complex-Number-Multiplication.md
similarity index 100%
rename from website/content/ChapterFour/0537.Complex-Number-Multiplication.md
rename to website/content/ChapterFour/0500~0599/0537.Complex-Number-Multiplication.md
diff --git a/website/content/ChapterFour/0541.Reverse-String-II.md b/website/content/ChapterFour/0500~0599/0541.Reverse-String-II.md
similarity index 100%
rename from website/content/ChapterFour/0541.Reverse-String-II.md
rename to website/content/ChapterFour/0500~0599/0541.Reverse-String-II.md
diff --git a/website/content/ChapterFour/0542.01-Matrix.md b/website/content/ChapterFour/0500~0599/0542.01-Matrix.md
similarity index 100%
rename from website/content/ChapterFour/0542.01-Matrix.md
rename to website/content/ChapterFour/0500~0599/0542.01-Matrix.md
diff --git a/website/content/ChapterFour/0547.Number-of-Provinces.md b/website/content/ChapterFour/0500~0599/0547.Number-of-Provinces.md
similarity index 100%
rename from website/content/ChapterFour/0547.Number-of-Provinces.md
rename to website/content/ChapterFour/0500~0599/0547.Number-of-Provinces.md
diff --git a/website/content/ChapterFour/0557.Reverse-Words-in-a-String-III.md b/website/content/ChapterFour/0500~0599/0557.Reverse-Words-in-a-String-III.md
similarity index 100%
rename from website/content/ChapterFour/0557.Reverse-Words-in-a-String-III.md
rename to website/content/ChapterFour/0500~0599/0557.Reverse-Words-in-a-String-III.md
diff --git a/website/content/ChapterFour/0561.Array-Partition-I.md b/website/content/ChapterFour/0500~0599/0561.Array-Partition-I.md
similarity index 100%
rename from website/content/ChapterFour/0561.Array-Partition-I.md
rename to website/content/ChapterFour/0500~0599/0561.Array-Partition-I.md
diff --git a/website/content/ChapterFour/0563.Binary-Tree-Tilt.md b/website/content/ChapterFour/0500~0599/0563.Binary-Tree-Tilt.md
similarity index 100%
rename from website/content/ChapterFour/0563.Binary-Tree-Tilt.md
rename to website/content/ChapterFour/0500~0599/0563.Binary-Tree-Tilt.md
diff --git a/website/content/ChapterFour/0566.Reshape-the-Matrix.md b/website/content/ChapterFour/0500~0599/0566.Reshape-the-Matrix.md
similarity index 100%
rename from website/content/ChapterFour/0566.Reshape-the-Matrix.md
rename to website/content/ChapterFour/0500~0599/0566.Reshape-the-Matrix.md
diff --git a/website/content/ChapterFour/0567.Permutation-in-String.md b/website/content/ChapterFour/0500~0599/0567.Permutation-in-String.md
similarity index 100%
rename from website/content/ChapterFour/0567.Permutation-in-String.md
rename to website/content/ChapterFour/0500~0599/0567.Permutation-in-String.md
diff --git a/website/content/ChapterFour/0572.Subtree-of-Another-Tree.md b/website/content/ChapterFour/0500~0599/0572.Subtree-of-Another-Tree.md
similarity index 100%
rename from website/content/ChapterFour/0572.Subtree-of-Another-Tree.md
rename to website/content/ChapterFour/0500~0599/0572.Subtree-of-Another-Tree.md
diff --git a/website/content/ChapterFour/0575.Distribute-Candies.md b/website/content/ChapterFour/0500~0599/0575.Distribute-Candies.md
similarity index 100%
rename from website/content/ChapterFour/0575.Distribute-Candies.md
rename to website/content/ChapterFour/0500~0599/0575.Distribute-Candies.md
diff --git a/website/content/ChapterFour/0594.Longest-Harmonious-Subsequence.md b/website/content/ChapterFour/0500~0599/0594.Longest-Harmonious-Subsequence.md
similarity index 100%
rename from website/content/ChapterFour/0594.Longest-Harmonious-Subsequence.md
rename to website/content/ChapterFour/0500~0599/0594.Longest-Harmonious-Subsequence.md
diff --git a/website/content/ChapterFour/0598.Range-Addition-II.md b/website/content/ChapterFour/0500~0599/0598.Range-Addition-II.md
similarity index 100%
rename from website/content/ChapterFour/0598.Range-Addition-II.md
rename to website/content/ChapterFour/0500~0599/0598.Range-Addition-II.md
diff --git a/website/content/ChapterFour/0599.Minimum-Index-Sum-of-Two-Lists.md b/website/content/ChapterFour/0500~0599/0599.Minimum-Index-Sum-of-Two-Lists.md
similarity index 100%
rename from website/content/ChapterFour/0599.Minimum-Index-Sum-of-Two-Lists.md
rename to website/content/ChapterFour/0500~0599/0599.Minimum-Index-Sum-of-Two-Lists.md
diff --git a/website/content/ChapterFour/0500~0599/_index.md b/website/content/ChapterFour/0500~0599/_index.md
new file mode 100644
index 000000000..d2021683f
--- /dev/null
+++ b/website/content/ChapterFour/0500~0599/_index.md
@@ -0,0 +1,5 @@
+---
+bookCollapseSection: true
+weight: 20
+---
+
diff --git a/website/content/ChapterFour/0605.Can-Place-Flowers.md b/website/content/ChapterFour/0600~0699/0605.Can-Place-Flowers.md
similarity index 100%
rename from website/content/ChapterFour/0605.Can-Place-Flowers.md
rename to website/content/ChapterFour/0600~0699/0605.Can-Place-Flowers.md
diff --git a/website/content/ChapterFour/0628.Maximum-Product-of-Three-Numbers.md b/website/content/ChapterFour/0600~0699/0628.Maximum-Product-of-Three-Numbers.md
similarity index 100%
rename from website/content/ChapterFour/0628.Maximum-Product-of-Three-Numbers.md
rename to website/content/ChapterFour/0600~0699/0628.Maximum-Product-of-Three-Numbers.md
diff --git a/website/content/ChapterFour/0632.Smallest-Range-Covering-Elements-from-K-Lists.md b/website/content/ChapterFour/0600~0699/0632.Smallest-Range-Covering-Elements-from-K-Lists.md
similarity index 100%
rename from website/content/ChapterFour/0632.Smallest-Range-Covering-Elements-from-K-Lists.md
rename to website/content/ChapterFour/0600~0699/0632.Smallest-Range-Covering-Elements-from-K-Lists.md
diff --git a/website/content/ChapterFour/0633.Sum-of-Square-Numbers.md b/website/content/ChapterFour/0600~0699/0633.Sum-of-Square-Numbers.md
similarity index 100%
rename from website/content/ChapterFour/0633.Sum-of-Square-Numbers.md
rename to website/content/ChapterFour/0600~0699/0633.Sum-of-Square-Numbers.md
diff --git a/website/content/ChapterFour/0636.Exclusive-Time-of-Functions.md b/website/content/ChapterFour/0600~0699/0636.Exclusive-Time-of-Functions.md
similarity index 100%
rename from website/content/ChapterFour/0636.Exclusive-Time-of-Functions.md
rename to website/content/ChapterFour/0600~0699/0636.Exclusive-Time-of-Functions.md
diff --git a/website/content/ChapterFour/0637.Average-of-Levels-in-Binary-Tree.md b/website/content/ChapterFour/0600~0699/0637.Average-of-Levels-in-Binary-Tree.md
similarity index 100%
rename from website/content/ChapterFour/0637.Average-of-Levels-in-Binary-Tree.md
rename to website/content/ChapterFour/0600~0699/0637.Average-of-Levels-in-Binary-Tree.md
diff --git a/website/content/ChapterFour/0638.Shopping-Offers.md b/website/content/ChapterFour/0600~0699/0638.Shopping-Offers.md
similarity index 100%
rename from website/content/ChapterFour/0638.Shopping-Offers.md
rename to website/content/ChapterFour/0600~0699/0638.Shopping-Offers.md
diff --git a/website/content/ChapterFour/0645.Set-Mismatch.md b/website/content/ChapterFour/0600~0699/0645.Set-Mismatch.md
similarity index 100%
rename from website/content/ChapterFour/0645.Set-Mismatch.md
rename to website/content/ChapterFour/0600~0699/0645.Set-Mismatch.md
diff --git a/website/content/ChapterFour/0648.Replace-Words.md b/website/content/ChapterFour/0600~0699/0648.Replace-Words.md
similarity index 100%
rename from website/content/ChapterFour/0648.Replace-Words.md
rename to website/content/ChapterFour/0600~0699/0648.Replace-Words.md
diff --git a/website/content/ChapterFour/0653.Two-Sum-IV---Input-is-a-BST.md b/website/content/ChapterFour/0600~0699/0653.Two-Sum-IV---Input-is-a-BST.md
similarity index 100%
rename from website/content/ChapterFour/0653.Two-Sum-IV---Input-is-a-BST.md
rename to website/content/ChapterFour/0600~0699/0653.Two-Sum-IV---Input-is-a-BST.md
diff --git a/website/content/ChapterFour/0658.Find-K-Closest-Elements.md b/website/content/ChapterFour/0600~0699/0658.Find-K-Closest-Elements.md
similarity index 100%
rename from website/content/ChapterFour/0658.Find-K-Closest-Elements.md
rename to website/content/ChapterFour/0600~0699/0658.Find-K-Closest-Elements.md
diff --git a/website/content/ChapterFour/0661.Image-Smoother.md b/website/content/ChapterFour/0600~0699/0661.Image-Smoother.md
similarity index 100%
rename from website/content/ChapterFour/0661.Image-Smoother.md
rename to website/content/ChapterFour/0600~0699/0661.Image-Smoother.md
diff --git a/website/content/ChapterFour/0662.Maximum-Width-of-Binary-Tree.md b/website/content/ChapterFour/0600~0699/0662.Maximum-Width-of-Binary-Tree.md
similarity index 100%
rename from website/content/ChapterFour/0662.Maximum-Width-of-Binary-Tree.md
rename to website/content/ChapterFour/0600~0699/0662.Maximum-Width-of-Binary-Tree.md
diff --git a/website/content/ChapterFour/0668.Kth-Smallest-Number-in-Multiplication-Table.md b/website/content/ChapterFour/0600~0699/0668.Kth-Smallest-Number-in-Multiplication-Table.md
similarity index 100%
rename from website/content/ChapterFour/0668.Kth-Smallest-Number-in-Multiplication-Table.md
rename to website/content/ChapterFour/0600~0699/0668.Kth-Smallest-Number-in-Multiplication-Table.md
diff --git a/website/content/ChapterFour/0674.Longest-Continuous-Increasing-Subsequence.md b/website/content/ChapterFour/0600~0699/0674.Longest-Continuous-Increasing-Subsequence.md
similarity index 100%
rename from website/content/ChapterFour/0674.Longest-Continuous-Increasing-Subsequence.md
rename to website/content/ChapterFour/0600~0699/0674.Longest-Continuous-Increasing-Subsequence.md
diff --git a/website/content/ChapterFour/0676.Implement-Magic-Dictionary.md b/website/content/ChapterFour/0600~0699/0676.Implement-Magic-Dictionary.md
similarity index 100%
rename from website/content/ChapterFour/0676.Implement-Magic-Dictionary.md
rename to website/content/ChapterFour/0600~0699/0676.Implement-Magic-Dictionary.md
diff --git a/website/content/ChapterFour/0682.Baseball-Game.md b/website/content/ChapterFour/0600~0699/0682.Baseball-Game.md
similarity index 100%
rename from website/content/ChapterFour/0682.Baseball-Game.md
rename to website/content/ChapterFour/0600~0699/0682.Baseball-Game.md
diff --git a/website/content/ChapterFour/0684.Redundant-Connection.md b/website/content/ChapterFour/0600~0699/0684.Redundant-Connection.md
similarity index 100%
rename from website/content/ChapterFour/0684.Redundant-Connection.md
rename to website/content/ChapterFour/0600~0699/0684.Redundant-Connection.md
diff --git a/website/content/ChapterFour/0685.Redundant-Connection-II.md b/website/content/ChapterFour/0600~0699/0685.Redundant-Connection-II.md
similarity index 100%
rename from website/content/ChapterFour/0685.Redundant-Connection-II.md
rename to website/content/ChapterFour/0600~0699/0685.Redundant-Connection-II.md
diff --git a/website/content/ChapterFour/0693.Binary-Number-with-Alternating-Bits.md b/website/content/ChapterFour/0600~0699/0693.Binary-Number-with-Alternating-Bits.md
similarity index 100%
rename from website/content/ChapterFour/0693.Binary-Number-with-Alternating-Bits.md
rename to website/content/ChapterFour/0600~0699/0693.Binary-Number-with-Alternating-Bits.md
diff --git a/website/content/ChapterFour/0695.Max-Area-of-Island.md b/website/content/ChapterFour/0600~0699/0695.Max-Area-of-Island.md
similarity index 100%
rename from website/content/ChapterFour/0695.Max-Area-of-Island.md
rename to website/content/ChapterFour/0600~0699/0695.Max-Area-of-Island.md
diff --git a/website/content/ChapterFour/0697.Degree-of-an-Array.md b/website/content/ChapterFour/0600~0699/0697.Degree-of-an-Array.md
similarity index 100%
rename from website/content/ChapterFour/0697.Degree-of-an-Array.md
rename to website/content/ChapterFour/0600~0699/0697.Degree-of-an-Array.md
diff --git a/website/content/ChapterFour/0699.Falling-Squares.md b/website/content/ChapterFour/0600~0699/0699.Falling-Squares.md
similarity index 100%
rename from website/content/ChapterFour/0699.Falling-Squares.md
rename to website/content/ChapterFour/0600~0699/0699.Falling-Squares.md
diff --git a/website/content/ChapterFour/0600~0699/_index.md b/website/content/ChapterFour/0600~0699/_index.md
new file mode 100644
index 000000000..d2021683f
--- /dev/null
+++ b/website/content/ChapterFour/0600~0699/_index.md
@@ -0,0 +1,5 @@
+---
+bookCollapseSection: true
+weight: 20
+---
+
diff --git a/website/content/ChapterFour/0704.Binary-Search.md b/website/content/ChapterFour/0700~0799/0704.Binary-Search.md
similarity index 100%
rename from website/content/ChapterFour/0704.Binary-Search.md
rename to website/content/ChapterFour/0700~0799/0704.Binary-Search.md
diff --git a/website/content/ChapterFour/0705.Design-HashSet.md b/website/content/ChapterFour/0700~0799/0705.Design-HashSet.md
similarity index 100%
rename from website/content/ChapterFour/0705.Design-HashSet.md
rename to website/content/ChapterFour/0700~0799/0705.Design-HashSet.md
diff --git a/website/content/ChapterFour/0706.Design-HashMap.md b/website/content/ChapterFour/0700~0799/0706.Design-HashMap.md
similarity index 100%
rename from website/content/ChapterFour/0706.Design-HashMap.md
rename to website/content/ChapterFour/0700~0799/0706.Design-HashMap.md
diff --git a/website/content/ChapterFour/0707.Design-Linked-List.md b/website/content/ChapterFour/0700~0799/0707.Design-Linked-List.md
similarity index 100%
rename from website/content/ChapterFour/0707.Design-Linked-List.md
rename to website/content/ChapterFour/0700~0799/0707.Design-Linked-List.md
diff --git a/website/content/ChapterFour/0710.Random-Pick-with-Blacklist.md b/website/content/ChapterFour/0700~0799/0710.Random-Pick-with-Blacklist.md
similarity index 100%
rename from website/content/ChapterFour/0710.Random-Pick-with-Blacklist.md
rename to website/content/ChapterFour/0700~0799/0710.Random-Pick-with-Blacklist.md
diff --git a/website/content/ChapterFour/0713.Subarray-Product-Less-Than-K.md b/website/content/ChapterFour/0700~0799/0713.Subarray-Product-Less-Than-K.md
similarity index 100%
rename from website/content/ChapterFour/0713.Subarray-Product-Less-Than-K.md
rename to website/content/ChapterFour/0700~0799/0713.Subarray-Product-Less-Than-K.md
diff --git a/website/content/ChapterFour/0714.Best-Time-to-Buy-and-Sell-Stock-with-Transaction-Fee.md b/website/content/ChapterFour/0700~0799/0714.Best-Time-to-Buy-and-Sell-Stock-with-Transaction-Fee.md
similarity index 100%
rename from website/content/ChapterFour/0714.Best-Time-to-Buy-and-Sell-Stock-with-Transaction-Fee.md
rename to website/content/ChapterFour/0700~0799/0714.Best-Time-to-Buy-and-Sell-Stock-with-Transaction-Fee.md
diff --git a/website/content/ChapterFour/0715.Range-Module.md b/website/content/ChapterFour/0700~0799/0715.Range-Module.md
similarity index 100%
rename from website/content/ChapterFour/0715.Range-Module.md
rename to website/content/ChapterFour/0700~0799/0715.Range-Module.md
diff --git a/website/content/ChapterFour/0717.1-bit-and-2-bit-Characters.md b/website/content/ChapterFour/0700~0799/0717.1-bit-and-2-bit-Characters.md
similarity index 100%
rename from website/content/ChapterFour/0717.1-bit-and-2-bit-Characters.md
rename to website/content/ChapterFour/0700~0799/0717.1-bit-and-2-bit-Characters.md
diff --git a/website/content/ChapterFour/0718.Maximum-Length-of-Repeated-Subarray.md b/website/content/ChapterFour/0700~0799/0718.Maximum-Length-of-Repeated-Subarray.md
similarity index 100%
rename from website/content/ChapterFour/0718.Maximum-Length-of-Repeated-Subarray.md
rename to website/content/ChapterFour/0700~0799/0718.Maximum-Length-of-Repeated-Subarray.md
diff --git a/website/content/ChapterFour/0719.Find-K-th-Smallest-Pair-Distance.md b/website/content/ChapterFour/0700~0799/0719.Find-K-th-Smallest-Pair-Distance.md
similarity index 100%
rename from website/content/ChapterFour/0719.Find-K-th-Smallest-Pair-Distance.md
rename to website/content/ChapterFour/0700~0799/0719.Find-K-th-Smallest-Pair-Distance.md
diff --git a/website/content/ChapterFour/0720.Longest-Word-in-Dictionary.md b/website/content/ChapterFour/0700~0799/0720.Longest-Word-in-Dictionary.md
similarity index 100%
rename from website/content/ChapterFour/0720.Longest-Word-in-Dictionary.md
rename to website/content/ChapterFour/0700~0799/0720.Longest-Word-in-Dictionary.md
diff --git a/website/content/ChapterFour/0721.Accounts-Merge.md b/website/content/ChapterFour/0700~0799/0721.Accounts-Merge.md
similarity index 100%
rename from website/content/ChapterFour/0721.Accounts-Merge.md
rename to website/content/ChapterFour/0700~0799/0721.Accounts-Merge.md
diff --git a/website/content/ChapterFour/0724.Find-Pivot-Index.md b/website/content/ChapterFour/0700~0799/0724.Find-Pivot-Index.md
similarity index 100%
rename from website/content/ChapterFour/0724.Find-Pivot-Index.md
rename to website/content/ChapterFour/0700~0799/0724.Find-Pivot-Index.md
diff --git a/website/content/ChapterFour/0725.Split-Linked-List-in-Parts.md b/website/content/ChapterFour/0700~0799/0725.Split-Linked-List-in-Parts.md
similarity index 100%
rename from website/content/ChapterFour/0725.Split-Linked-List-in-Parts.md
rename to website/content/ChapterFour/0700~0799/0725.Split-Linked-List-in-Parts.md
diff --git a/website/content/ChapterFour/0726.Number-of-Atoms.md b/website/content/ChapterFour/0700~0799/0726.Number-of-Atoms.md
similarity index 100%
rename from website/content/ChapterFour/0726.Number-of-Atoms.md
rename to website/content/ChapterFour/0700~0799/0726.Number-of-Atoms.md
diff --git a/website/content/ChapterFour/0729.My-Calendar-I.md b/website/content/ChapterFour/0700~0799/0729.My-Calendar-I.md
similarity index 100%
rename from website/content/ChapterFour/0729.My-Calendar-I.md
rename to website/content/ChapterFour/0700~0799/0729.My-Calendar-I.md
diff --git a/website/content/ChapterFour/0732.My-Calendar-III.md b/website/content/ChapterFour/0700~0799/0732.My-Calendar-III.md
similarity index 100%
rename from website/content/ChapterFour/0732.My-Calendar-III.md
rename to website/content/ChapterFour/0700~0799/0732.My-Calendar-III.md
diff --git a/website/content/ChapterFour/0733.Flood-Fill.md b/website/content/ChapterFour/0700~0799/0733.Flood-Fill.md
similarity index 100%
rename from website/content/ChapterFour/0733.Flood-Fill.md
rename to website/content/ChapterFour/0700~0799/0733.Flood-Fill.md
diff --git a/website/content/ChapterFour/0735.Asteroid-Collision.md b/website/content/ChapterFour/0700~0799/0735.Asteroid-Collision.md
similarity index 100%
rename from website/content/ChapterFour/0735.Asteroid-Collision.md
rename to website/content/ChapterFour/0700~0799/0735.Asteroid-Collision.md
diff --git a/website/content/ChapterFour/0739.Daily-Temperatures.md b/website/content/ChapterFour/0700~0799/0739.Daily-Temperatures.md
similarity index 100%
rename from website/content/ChapterFour/0739.Daily-Temperatures.md
rename to website/content/ChapterFour/0700~0799/0739.Daily-Temperatures.md
diff --git a/website/content/ChapterFour/0744.Find-Smallest-Letter-Greater-Than-Target.md b/website/content/ChapterFour/0700~0799/0744.Find-Smallest-Letter-Greater-Than-Target.md
similarity index 100%
rename from website/content/ChapterFour/0744.Find-Smallest-Letter-Greater-Than-Target.md
rename to website/content/ChapterFour/0700~0799/0744.Find-Smallest-Letter-Greater-Than-Target.md
diff --git a/website/content/ChapterFour/0745.Prefix-and-Suffix-Search.md b/website/content/ChapterFour/0700~0799/0745.Prefix-and-Suffix-Search.md
similarity index 100%
rename from website/content/ChapterFour/0745.Prefix-and-Suffix-Search.md
rename to website/content/ChapterFour/0700~0799/0745.Prefix-and-Suffix-Search.md
diff --git a/website/content/ChapterFour/0746.Min-Cost-Climbing-Stairs.md b/website/content/ChapterFour/0700~0799/0746.Min-Cost-Climbing-Stairs.md
similarity index 100%
rename from website/content/ChapterFour/0746.Min-Cost-Climbing-Stairs.md
rename to website/content/ChapterFour/0700~0799/0746.Min-Cost-Climbing-Stairs.md
diff --git a/website/content/ChapterFour/0748.Shortest-Completing-Word.md b/website/content/ChapterFour/0700~0799/0748.Shortest-Completing-Word.md
similarity index 100%
rename from website/content/ChapterFour/0748.Shortest-Completing-Word.md
rename to website/content/ChapterFour/0700~0799/0748.Shortest-Completing-Word.md
diff --git a/website/content/ChapterFour/0753.Cracking-the-Safe.md b/website/content/ChapterFour/0700~0799/0753.Cracking-the-Safe.md
similarity index 100%
rename from website/content/ChapterFour/0753.Cracking-the-Safe.md
rename to website/content/ChapterFour/0700~0799/0753.Cracking-the-Safe.md
diff --git a/website/content/ChapterFour/0756.Pyramid-Transition-Matrix.md b/website/content/ChapterFour/0700~0799/0756.Pyramid-Transition-Matrix.md
similarity index 100%
rename from website/content/ChapterFour/0756.Pyramid-Transition-Matrix.md
rename to website/content/ChapterFour/0700~0799/0756.Pyramid-Transition-Matrix.md
diff --git a/website/content/ChapterFour/0762.Prime-Number-of-Set-Bits-in-Binary-Representation.md b/website/content/ChapterFour/0700~0799/0762.Prime-Number-of-Set-Bits-in-Binary-Representation.md
similarity index 100%
rename from website/content/ChapterFour/0762.Prime-Number-of-Set-Bits-in-Binary-Representation.md
rename to website/content/ChapterFour/0700~0799/0762.Prime-Number-of-Set-Bits-in-Binary-Representation.md
diff --git a/website/content/ChapterFour/0763.Partition-Labels.md b/website/content/ChapterFour/0700~0799/0763.Partition-Labels.md
similarity index 100%
rename from website/content/ChapterFour/0763.Partition-Labels.md
rename to website/content/ChapterFour/0700~0799/0763.Partition-Labels.md
diff --git a/website/content/ChapterFour/0765.Couples-Holding-Hands.md b/website/content/ChapterFour/0700~0799/0765.Couples-Holding-Hands.md
similarity index 100%
rename from website/content/ChapterFour/0765.Couples-Holding-Hands.md
rename to website/content/ChapterFour/0700~0799/0765.Couples-Holding-Hands.md
diff --git a/website/content/ChapterFour/0766.Toeplitz-Matrix.md b/website/content/ChapterFour/0700~0799/0766.Toeplitz-Matrix.md
similarity index 100%
rename from website/content/ChapterFour/0766.Toeplitz-Matrix.md
rename to website/content/ChapterFour/0700~0799/0766.Toeplitz-Matrix.md
diff --git a/website/content/ChapterFour/0767.Reorganize-String.md b/website/content/ChapterFour/0700~0799/0767.Reorganize-String.md
similarity index 100%
rename from website/content/ChapterFour/0767.Reorganize-String.md
rename to website/content/ChapterFour/0700~0799/0767.Reorganize-String.md
diff --git a/website/content/ChapterFour/0771.Jewels-and-Stones.md b/website/content/ChapterFour/0700~0799/0771.Jewels-and-Stones.md
similarity index 100%
rename from website/content/ChapterFour/0771.Jewels-and-Stones.md
rename to website/content/ChapterFour/0700~0799/0771.Jewels-and-Stones.md
diff --git a/website/content/ChapterFour/0778.Swim-in-Rising-Water.md b/website/content/ChapterFour/0700~0799/0778.Swim-in-Rising-Water.md
similarity index 100%
rename from website/content/ChapterFour/0778.Swim-in-Rising-Water.md
rename to website/content/ChapterFour/0700~0799/0778.Swim-in-Rising-Water.md
diff --git a/website/content/ChapterFour/0781.Rabbits-in-Forest.md b/website/content/ChapterFour/0700~0799/0781.Rabbits-in-Forest.md
similarity index 100%
rename from website/content/ChapterFour/0781.Rabbits-in-Forest.md
rename to website/content/ChapterFour/0700~0799/0781.Rabbits-in-Forest.md
diff --git a/website/content/ChapterFour/0784.Letter-Case-Permutation.md b/website/content/ChapterFour/0700~0799/0784.Letter-Case-Permutation.md
similarity index 100%
rename from website/content/ChapterFour/0784.Letter-Case-Permutation.md
rename to website/content/ChapterFour/0700~0799/0784.Letter-Case-Permutation.md
diff --git a/website/content/ChapterFour/0785.Is-Graph-Bipartite.md b/website/content/ChapterFour/0700~0799/0785.Is-Graph-Bipartite.md
similarity index 100%
rename from website/content/ChapterFour/0785.Is-Graph-Bipartite.md
rename to website/content/ChapterFour/0700~0799/0785.Is-Graph-Bipartite.md
diff --git a/website/content/ChapterFour/0786.K-th-Smallest-Prime-Fraction.md b/website/content/ChapterFour/0700~0799/0786.K-th-Smallest-Prime-Fraction.md
similarity index 100%
rename from website/content/ChapterFour/0786.K-th-Smallest-Prime-Fraction.md
rename to website/content/ChapterFour/0700~0799/0786.K-th-Smallest-Prime-Fraction.md
diff --git a/website/content/ChapterFour/0793.Preimage-Size-of-Factorial-Zeroes-Function.md b/website/content/ChapterFour/0700~0799/0793.Preimage-Size-of-Factorial-Zeroes-Function.md
similarity index 100%
rename from website/content/ChapterFour/0793.Preimage-Size-of-Factorial-Zeroes-Function.md
rename to website/content/ChapterFour/0700~0799/0793.Preimage-Size-of-Factorial-Zeroes-Function.md
diff --git a/website/content/ChapterFour/0700~0799/_index.md b/website/content/ChapterFour/0700~0799/_index.md
new file mode 100644
index 000000000..d2021683f
--- /dev/null
+++ b/website/content/ChapterFour/0700~0799/_index.md
@@ -0,0 +1,5 @@
+---
+bookCollapseSection: true
+weight: 20
+---
+
diff --git a/website/content/ChapterFour/0802.Find-Eventual-Safe-States.md b/website/content/ChapterFour/0800~0899/0802.Find-Eventual-Safe-States.md
similarity index 100%
rename from website/content/ChapterFour/0802.Find-Eventual-Safe-States.md
rename to website/content/ChapterFour/0800~0899/0802.Find-Eventual-Safe-States.md
diff --git a/website/content/ChapterFour/0803.Bricks-Falling-When-Hit.md b/website/content/ChapterFour/0800~0899/0803.Bricks-Falling-When-Hit.md
similarity index 100%
rename from website/content/ChapterFour/0803.Bricks-Falling-When-Hit.md
rename to website/content/ChapterFour/0800~0899/0803.Bricks-Falling-When-Hit.md
diff --git a/website/content/ChapterFour/0811.Subdomain-Visit-Count.md b/website/content/ChapterFour/0800~0899/0811.Subdomain-Visit-Count.md
similarity index 100%
rename from website/content/ChapterFour/0811.Subdomain-Visit-Count.md
rename to website/content/ChapterFour/0800~0899/0811.Subdomain-Visit-Count.md
diff --git a/website/content/ChapterFour/0812.Largest-Triangle-Area.md b/website/content/ChapterFour/0800~0899/0812.Largest-Triangle-Area.md
similarity index 100%
rename from website/content/ChapterFour/0812.Largest-Triangle-Area.md
rename to website/content/ChapterFour/0800~0899/0812.Largest-Triangle-Area.md
diff --git a/website/content/ChapterFour/0815.Bus-Routes.md b/website/content/ChapterFour/0800~0899/0815.Bus-Routes.md
similarity index 100%
rename from website/content/ChapterFour/0815.Bus-Routes.md
rename to website/content/ChapterFour/0800~0899/0815.Bus-Routes.md
diff --git a/website/content/ChapterFour/0817.Linked-List-Components.md b/website/content/ChapterFour/0800~0899/0817.Linked-List-Components.md
similarity index 100%
rename from website/content/ChapterFour/0817.Linked-List-Components.md
rename to website/content/ChapterFour/0800~0899/0817.Linked-List-Components.md
diff --git a/website/content/ChapterFour/0819.Most-Common-Word.md b/website/content/ChapterFour/0800~0899/0819.Most-Common-Word.md
similarity index 100%
rename from website/content/ChapterFour/0819.Most-Common-Word.md
rename to website/content/ChapterFour/0800~0899/0819.Most-Common-Word.md
diff --git a/website/content/ChapterFour/0826.Most-Profit-Assigning-Work.md b/website/content/ChapterFour/0800~0899/0826.Most-Profit-Assigning-Work.md
similarity index 100%
rename from website/content/ChapterFour/0826.Most-Profit-Assigning-Work.md
rename to website/content/ChapterFour/0800~0899/0826.Most-Profit-Assigning-Work.md
diff --git a/website/content/ChapterFour/0828.Count-Unique-Characters-of-All-Substrings-of-a-Given-String.md b/website/content/ChapterFour/0800~0899/0828.Count-Unique-Characters-of-All-Substrings-of-a-Given-String.md
similarity index 100%
rename from website/content/ChapterFour/0828.Count-Unique-Characters-of-All-Substrings-of-a-Given-String.md
rename to website/content/ChapterFour/0800~0899/0828.Count-Unique-Characters-of-All-Substrings-of-a-Given-String.md
diff --git a/website/content/ChapterFour/0830.Positions-of-Large-Groups.md b/website/content/ChapterFour/0800~0899/0830.Positions-of-Large-Groups.md
similarity index 100%
rename from website/content/ChapterFour/0830.Positions-of-Large-Groups.md
rename to website/content/ChapterFour/0800~0899/0830.Positions-of-Large-Groups.md
diff --git a/website/content/ChapterFour/0832.Flipping-an-Image.md b/website/content/ChapterFour/0800~0899/0832.Flipping-an-Image.md
similarity index 100%
rename from website/content/ChapterFour/0832.Flipping-an-Image.md
rename to website/content/ChapterFour/0800~0899/0832.Flipping-an-Image.md
diff --git a/website/content/ChapterFour/0834.Sum-of-Distances-in-Tree.md b/website/content/ChapterFour/0800~0899/0834.Sum-of-Distances-in-Tree.md
similarity index 100%
rename from website/content/ChapterFour/0834.Sum-of-Distances-in-Tree.md
rename to website/content/ChapterFour/0800~0899/0834.Sum-of-Distances-in-Tree.md
diff --git a/website/content/ChapterFour/0836.Rectangle-Overlap.md b/website/content/ChapterFour/0800~0899/0836.Rectangle-Overlap.md
similarity index 100%
rename from website/content/ChapterFour/0836.Rectangle-Overlap.md
rename to website/content/ChapterFour/0800~0899/0836.Rectangle-Overlap.md
diff --git a/website/content/ChapterFour/0838.Push-Dominoes.md b/website/content/ChapterFour/0800~0899/0838.Push-Dominoes.md
similarity index 100%
rename from website/content/ChapterFour/0838.Push-Dominoes.md
rename to website/content/ChapterFour/0800~0899/0838.Push-Dominoes.md
diff --git a/website/content/ChapterFour/0839.Similar-String-Groups.md b/website/content/ChapterFour/0800~0899/0839.Similar-String-Groups.md
similarity index 100%
rename from website/content/ChapterFour/0839.Similar-String-Groups.md
rename to website/content/ChapterFour/0800~0899/0839.Similar-String-Groups.md
diff --git a/website/content/ChapterFour/0841.Keys-and-Rooms.md b/website/content/ChapterFour/0800~0899/0841.Keys-and-Rooms.md
similarity index 100%
rename from website/content/ChapterFour/0841.Keys-and-Rooms.md
rename to website/content/ChapterFour/0800~0899/0841.Keys-and-Rooms.md
diff --git a/website/content/ChapterFour/0842.Split-Array-into-Fibonacci-Sequence.md b/website/content/ChapterFour/0800~0899/0842.Split-Array-into-Fibonacci-Sequence.md
similarity index 100%
rename from website/content/ChapterFour/0842.Split-Array-into-Fibonacci-Sequence.md
rename to website/content/ChapterFour/0800~0899/0842.Split-Array-into-Fibonacci-Sequence.md
diff --git a/website/content/ChapterFour/0844.Backspace-String-Compare.md b/website/content/ChapterFour/0800~0899/0844.Backspace-String-Compare.md
similarity index 100%
rename from website/content/ChapterFour/0844.Backspace-String-Compare.md
rename to website/content/ChapterFour/0800~0899/0844.Backspace-String-Compare.md
diff --git a/website/content/ChapterFour/0845.Longest-Mountain-in-Array.md b/website/content/ChapterFour/0800~0899/0845.Longest-Mountain-in-Array.md
similarity index 100%
rename from website/content/ChapterFour/0845.Longest-Mountain-in-Array.md
rename to website/content/ChapterFour/0800~0899/0845.Longest-Mountain-in-Array.md
diff --git a/website/content/ChapterFour/0850.Rectangle-Area-II.md b/website/content/ChapterFour/0800~0899/0850.Rectangle-Area-II.md
similarity index 100%
rename from website/content/ChapterFour/0850.Rectangle-Area-II.md
rename to website/content/ChapterFour/0800~0899/0850.Rectangle-Area-II.md
diff --git a/website/content/ChapterFour/0851.Loud-and-Rich.md b/website/content/ChapterFour/0800~0899/0851.Loud-and-Rich.md
similarity index 100%
rename from website/content/ChapterFour/0851.Loud-and-Rich.md
rename to website/content/ChapterFour/0800~0899/0851.Loud-and-Rich.md
diff --git a/website/content/ChapterFour/0852.Peak-Index-in-a-Mountain-Array.md b/website/content/ChapterFour/0800~0899/0852.Peak-Index-in-a-Mountain-Array.md
similarity index 100%
rename from website/content/ChapterFour/0852.Peak-Index-in-a-Mountain-Array.md
rename to website/content/ChapterFour/0800~0899/0852.Peak-Index-in-a-Mountain-Array.md
diff --git a/website/content/ChapterFour/0853.Car-Fleet.md b/website/content/ChapterFour/0800~0899/0853.Car-Fleet.md
similarity index 100%
rename from website/content/ChapterFour/0853.Car-Fleet.md
rename to website/content/ChapterFour/0800~0899/0853.Car-Fleet.md
diff --git a/website/content/ChapterFour/0856.Score-of-Parentheses.md b/website/content/ChapterFour/0800~0899/0856.Score-of-Parentheses.md
similarity index 100%
rename from website/content/ChapterFour/0856.Score-of-Parentheses.md
rename to website/content/ChapterFour/0800~0899/0856.Score-of-Parentheses.md
diff --git a/website/content/ChapterFour/0862.Shortest-Subarray-with-Sum-at-Least-K.md b/website/content/ChapterFour/0800~0899/0862.Shortest-Subarray-with-Sum-at-Least-K.md
similarity index 100%
rename from website/content/ChapterFour/0862.Shortest-Subarray-with-Sum-at-Least-K.md
rename to website/content/ChapterFour/0800~0899/0862.Shortest-Subarray-with-Sum-at-Least-K.md
diff --git a/website/content/ChapterFour/0863.All-Nodes-Distance-K-in-Binary-Tree.md b/website/content/ChapterFour/0800~0899/0863.All-Nodes-Distance-K-in-Binary-Tree.md
similarity index 100%
rename from website/content/ChapterFour/0863.All-Nodes-Distance-K-in-Binary-Tree.md
rename to website/content/ChapterFour/0800~0899/0863.All-Nodes-Distance-K-in-Binary-Tree.md
diff --git a/website/content/ChapterFour/0864.Shortest-Path-to-Get-All-Keys.md b/website/content/ChapterFour/0800~0899/0864.Shortest-Path-to-Get-All-Keys.md
similarity index 100%
rename from website/content/ChapterFour/0864.Shortest-Path-to-Get-All-Keys.md
rename to website/content/ChapterFour/0800~0899/0864.Shortest-Path-to-Get-All-Keys.md
diff --git a/website/content/ChapterFour/0867.Transpose-Matrix.md b/website/content/ChapterFour/0800~0899/0867.Transpose-Matrix.md
similarity index 100%
rename from website/content/ChapterFour/0867.Transpose-Matrix.md
rename to website/content/ChapterFour/0800~0899/0867.Transpose-Matrix.md
diff --git a/website/content/ChapterFour/0872.Leaf-Similar-Trees.md b/website/content/ChapterFour/0800~0899/0872.Leaf-Similar-Trees.md
similarity index 100%
rename from website/content/ChapterFour/0872.Leaf-Similar-Trees.md
rename to website/content/ChapterFour/0800~0899/0872.Leaf-Similar-Trees.md
diff --git a/website/content/ChapterFour/0875.Koko-Eating-Bananas.md b/website/content/ChapterFour/0800~0899/0875.Koko-Eating-Bananas.md
similarity index 100%
rename from website/content/ChapterFour/0875.Koko-Eating-Bananas.md
rename to website/content/ChapterFour/0800~0899/0875.Koko-Eating-Bananas.md
diff --git a/website/content/ChapterFour/0876.Middle-of-the-Linked-List.md b/website/content/ChapterFour/0800~0899/0876.Middle-of-the-Linked-List.md
similarity index 100%
rename from website/content/ChapterFour/0876.Middle-of-the-Linked-List.md
rename to website/content/ChapterFour/0800~0899/0876.Middle-of-the-Linked-List.md
diff --git a/website/content/ChapterFour/0878.Nth-Magical-Number.md b/website/content/ChapterFour/0800~0899/0878.Nth-Magical-Number.md
similarity index 100%
rename from website/content/ChapterFour/0878.Nth-Magical-Number.md
rename to website/content/ChapterFour/0800~0899/0878.Nth-Magical-Number.md
diff --git a/website/content/ChapterFour/0880.Decoded-String-at-Index.md b/website/content/ChapterFour/0800~0899/0880.Decoded-String-at-Index.md
similarity index 100%
rename from website/content/ChapterFour/0880.Decoded-String-at-Index.md
rename to website/content/ChapterFour/0800~0899/0880.Decoded-String-at-Index.md
diff --git a/website/content/ChapterFour/0881.Boats-to-Save-People.md b/website/content/ChapterFour/0800~0899/0881.Boats-to-Save-People.md
similarity index 100%
rename from website/content/ChapterFour/0881.Boats-to-Save-People.md
rename to website/content/ChapterFour/0800~0899/0881.Boats-to-Save-People.md
diff --git a/website/content/ChapterFour/0884.Uncommon-Words-from-Two-Sentences.md b/website/content/ChapterFour/0800~0899/0884.Uncommon-Words-from-Two-Sentences.md
similarity index 100%
rename from website/content/ChapterFour/0884.Uncommon-Words-from-Two-Sentences.md
rename to website/content/ChapterFour/0800~0899/0884.Uncommon-Words-from-Two-Sentences.md
diff --git a/website/content/ChapterFour/0885.Spiral-Matrix-III.md b/website/content/ChapterFour/0800~0899/0885.Spiral-Matrix-III.md
similarity index 100%
rename from website/content/ChapterFour/0885.Spiral-Matrix-III.md
rename to website/content/ChapterFour/0800~0899/0885.Spiral-Matrix-III.md
diff --git a/website/content/ChapterFour/0887.Super-Egg-Drop.md b/website/content/ChapterFour/0800~0899/0887.Super-Egg-Drop.md
similarity index 100%
rename from website/content/ChapterFour/0887.Super-Egg-Drop.md
rename to website/content/ChapterFour/0800~0899/0887.Super-Egg-Drop.md
diff --git a/website/content/ChapterFour/0888.Fair-Candy-Swap.md b/website/content/ChapterFour/0800~0899/0888.Fair-Candy-Swap.md
similarity index 100%
rename from website/content/ChapterFour/0888.Fair-Candy-Swap.md
rename to website/content/ChapterFour/0800~0899/0888.Fair-Candy-Swap.md
diff --git a/website/content/ChapterFour/0891.Sum-of-Subsequence-Widths.md b/website/content/ChapterFour/0800~0899/0891.Sum-of-Subsequence-Widths.md
similarity index 100%
rename from website/content/ChapterFour/0891.Sum-of-Subsequence-Widths.md
rename to website/content/ChapterFour/0800~0899/0891.Sum-of-Subsequence-Widths.md
diff --git a/website/content/ChapterFour/0892.Surface-Area-of-3D-Shapes.md b/website/content/ChapterFour/0800~0899/0892.Surface-Area-of-3D-Shapes.md
similarity index 100%
rename from website/content/ChapterFour/0892.Surface-Area-of-3D-Shapes.md
rename to website/content/ChapterFour/0800~0899/0892.Surface-Area-of-3D-Shapes.md
diff --git a/website/content/ChapterFour/0895.Maximum-Frequency-Stack.md b/website/content/ChapterFour/0800~0899/0895.Maximum-Frequency-Stack.md
similarity index 100%
rename from website/content/ChapterFour/0895.Maximum-Frequency-Stack.md
rename to website/content/ChapterFour/0800~0899/0895.Maximum-Frequency-Stack.md
diff --git a/website/content/ChapterFour/0896.Monotonic-Array.md b/website/content/ChapterFour/0800~0899/0896.Monotonic-Array.md
similarity index 100%
rename from website/content/ChapterFour/0896.Monotonic-Array.md
rename to website/content/ChapterFour/0800~0899/0896.Monotonic-Array.md
diff --git a/website/content/ChapterFour/0897.Increasing-Order-Search-Tree.md b/website/content/ChapterFour/0800~0899/0897.Increasing-Order-Search-Tree.md
similarity index 100%
rename from website/content/ChapterFour/0897.Increasing-Order-Search-Tree.md
rename to website/content/ChapterFour/0800~0899/0897.Increasing-Order-Search-Tree.md
diff --git a/website/content/ChapterFour/0898.Bitwise-ORs-of-Subarrays.md b/website/content/ChapterFour/0800~0899/0898.Bitwise-ORs-of-Subarrays.md
similarity index 100%
rename from website/content/ChapterFour/0898.Bitwise-ORs-of-Subarrays.md
rename to website/content/ChapterFour/0800~0899/0898.Bitwise-ORs-of-Subarrays.md
diff --git a/website/content/ChapterFour/0800~0899/_index.md b/website/content/ChapterFour/0800~0899/_index.md
new file mode 100644
index 000000000..d2021683f
--- /dev/null
+++ b/website/content/ChapterFour/0800~0899/_index.md
@@ -0,0 +1,5 @@
+---
+bookCollapseSection: true
+weight: 20
+---
+
diff --git a/website/content/ChapterFour/0901.Online-Stock-Span.md b/website/content/ChapterFour/0900~0999/0901.Online-Stock-Span.md
similarity index 100%
rename from website/content/ChapterFour/0901.Online-Stock-Span.md
rename to website/content/ChapterFour/0900~0999/0901.Online-Stock-Span.md
diff --git a/website/content/ChapterFour/0904.Fruit-Into-Baskets.md b/website/content/ChapterFour/0900~0999/0904.Fruit-Into-Baskets.md
similarity index 100%
rename from website/content/ChapterFour/0904.Fruit-Into-Baskets.md
rename to website/content/ChapterFour/0900~0999/0904.Fruit-Into-Baskets.md
diff --git a/website/content/ChapterFour/0907.Sum-of-Subarray-Minimums.md b/website/content/ChapterFour/0900~0999/0907.Sum-of-Subarray-Minimums.md
similarity index 100%
rename from website/content/ChapterFour/0907.Sum-of-Subarray-Minimums.md
rename to website/content/ChapterFour/0900~0999/0907.Sum-of-Subarray-Minimums.md
diff --git a/website/content/ChapterFour/0910.Smallest-Range-II.md b/website/content/ChapterFour/0900~0999/0910.Smallest-Range-II.md
similarity index 100%
rename from website/content/ChapterFour/0910.Smallest-Range-II.md
rename to website/content/ChapterFour/0900~0999/0910.Smallest-Range-II.md
diff --git a/website/content/ChapterFour/0911.Online-Election.md b/website/content/ChapterFour/0900~0999/0911.Online-Election.md
similarity index 100%
rename from website/content/ChapterFour/0911.Online-Election.md
rename to website/content/ChapterFour/0900~0999/0911.Online-Election.md
diff --git a/website/content/ChapterFour/0914.X-of-a-Kind-in-a-Deck-of-Cards.md b/website/content/ChapterFour/0900~0999/0914.X-of-a-Kind-in-a-Deck-of-Cards.md
similarity index 100%
rename from website/content/ChapterFour/0914.X-of-a-Kind-in-a-Deck-of-Cards.md
rename to website/content/ChapterFour/0900~0999/0914.X-of-a-Kind-in-a-Deck-of-Cards.md
diff --git a/website/content/ChapterFour/0918.Maximum-Sum-Circular-Subarray.md b/website/content/ChapterFour/0900~0999/0918.Maximum-Sum-Circular-Subarray.md
similarity index 100%
rename from website/content/ChapterFour/0918.Maximum-Sum-Circular-Subarray.md
rename to website/content/ChapterFour/0900~0999/0918.Maximum-Sum-Circular-Subarray.md
diff --git a/website/content/ChapterFour/0920.Number-of-Music-Playlists.md b/website/content/ChapterFour/0900~0999/0920.Number-of-Music-Playlists.md
similarity index 100%
rename from website/content/ChapterFour/0920.Number-of-Music-Playlists.md
rename to website/content/ChapterFour/0900~0999/0920.Number-of-Music-Playlists.md
diff --git a/website/content/ChapterFour/0921.Minimum-Add-to-Make-Parentheses-Valid.md b/website/content/ChapterFour/0900~0999/0921.Minimum-Add-to-Make-Parentheses-Valid.md
similarity index 100%
rename from website/content/ChapterFour/0921.Minimum-Add-to-Make-Parentheses-Valid.md
rename to website/content/ChapterFour/0900~0999/0921.Minimum-Add-to-Make-Parentheses-Valid.md
diff --git a/website/content/ChapterFour/0922.Sort-Array-By-Parity-II.md b/website/content/ChapterFour/0900~0999/0922.Sort-Array-By-Parity-II.md
similarity index 100%
rename from website/content/ChapterFour/0922.Sort-Array-By-Parity-II.md
rename to website/content/ChapterFour/0900~0999/0922.Sort-Array-By-Parity-II.md
diff --git a/website/content/ChapterFour/0923.3Sum-With-Multiplicity.md b/website/content/ChapterFour/0900~0999/0923.3Sum-With-Multiplicity.md
similarity index 100%
rename from website/content/ChapterFour/0923.3Sum-With-Multiplicity.md
rename to website/content/ChapterFour/0900~0999/0923.3Sum-With-Multiplicity.md
diff --git a/website/content/ChapterFour/0924.Minimize-Malware-Spread.md b/website/content/ChapterFour/0900~0999/0924.Minimize-Malware-Spread.md
similarity index 100%
rename from website/content/ChapterFour/0924.Minimize-Malware-Spread.md
rename to website/content/ChapterFour/0900~0999/0924.Minimize-Malware-Spread.md
diff --git a/website/content/ChapterFour/0925.Long-Pressed-Name.md b/website/content/ChapterFour/0900~0999/0925.Long-Pressed-Name.md
similarity index 100%
rename from website/content/ChapterFour/0925.Long-Pressed-Name.md
rename to website/content/ChapterFour/0900~0999/0925.Long-Pressed-Name.md
diff --git a/website/content/ChapterFour/0927.Three-Equal-Parts.md b/website/content/ChapterFour/0900~0999/0927.Three-Equal-Parts.md
similarity index 100%
rename from website/content/ChapterFour/0927.Three-Equal-Parts.md
rename to website/content/ChapterFour/0900~0999/0927.Three-Equal-Parts.md
diff --git a/website/content/ChapterFour/0928.Minimize-Malware-Spread-II.md b/website/content/ChapterFour/0900~0999/0928.Minimize-Malware-Spread-II.md
similarity index 100%
rename from website/content/ChapterFour/0928.Minimize-Malware-Spread-II.md
rename to website/content/ChapterFour/0900~0999/0928.Minimize-Malware-Spread-II.md
diff --git a/website/content/ChapterFour/0930.Binary-Subarrays-With-Sum.md b/website/content/ChapterFour/0900~0999/0930.Binary-Subarrays-With-Sum.md
similarity index 100%
rename from website/content/ChapterFour/0930.Binary-Subarrays-With-Sum.md
rename to website/content/ChapterFour/0900~0999/0930.Binary-Subarrays-With-Sum.md
diff --git a/website/content/ChapterFour/0933.Number-of-Recent-Calls.md b/website/content/ChapterFour/0900~0999/0933.Number-of-Recent-Calls.md
similarity index 100%
rename from website/content/ChapterFour/0933.Number-of-Recent-Calls.md
rename to website/content/ChapterFour/0900~0999/0933.Number-of-Recent-Calls.md
diff --git a/website/content/ChapterFour/0942.DI-String-Match.md b/website/content/ChapterFour/0900~0999/0942.DI-String-Match.md
similarity index 100%
rename from website/content/ChapterFour/0942.DI-String-Match.md
rename to website/content/ChapterFour/0900~0999/0942.DI-String-Match.md
diff --git a/website/content/ChapterFour/0946.Validate-Stack-Sequences.md b/website/content/ChapterFour/0900~0999/0946.Validate-Stack-Sequences.md
similarity index 100%
rename from website/content/ChapterFour/0946.Validate-Stack-Sequences.md
rename to website/content/ChapterFour/0900~0999/0946.Validate-Stack-Sequences.md
diff --git a/website/content/ChapterFour/0947.Most-Stones-Removed-with-Same-Row-or-Column.md b/website/content/ChapterFour/0900~0999/0947.Most-Stones-Removed-with-Same-Row-or-Column.md
similarity index 100%
rename from website/content/ChapterFour/0947.Most-Stones-Removed-with-Same-Row-or-Column.md
rename to website/content/ChapterFour/0900~0999/0947.Most-Stones-Removed-with-Same-Row-or-Column.md
diff --git a/website/content/ChapterFour/0949.Largest-Time-for-Given-Digits.md b/website/content/ChapterFour/0900~0999/0949.Largest-Time-for-Given-Digits.md
similarity index 100%
rename from website/content/ChapterFour/0949.Largest-Time-for-Given-Digits.md
rename to website/content/ChapterFour/0900~0999/0949.Largest-Time-for-Given-Digits.md
diff --git a/website/content/ChapterFour/0952.Largest-Component-Size-by-Common-Factor.md b/website/content/ChapterFour/0900~0999/0952.Largest-Component-Size-by-Common-Factor.md
similarity index 100%
rename from website/content/ChapterFour/0952.Largest-Component-Size-by-Common-Factor.md
rename to website/content/ChapterFour/0900~0999/0952.Largest-Component-Size-by-Common-Factor.md
diff --git a/website/content/ChapterFour/0953.Verifying-an-Alien-Dictionary.md b/website/content/ChapterFour/0900~0999/0953.Verifying-an-Alien-Dictionary.md
similarity index 100%
rename from website/content/ChapterFour/0953.Verifying-an-Alien-Dictionary.md
rename to website/content/ChapterFour/0900~0999/0953.Verifying-an-Alien-Dictionary.md
diff --git a/website/content/ChapterFour/0959.Regions-Cut-By-Slashes.md b/website/content/ChapterFour/0900~0999/0959.Regions-Cut-By-Slashes.md
similarity index 100%
rename from website/content/ChapterFour/0959.Regions-Cut-By-Slashes.md
rename to website/content/ChapterFour/0900~0999/0959.Regions-Cut-By-Slashes.md
diff --git a/website/content/ChapterFour/0961.N-Repeated-Element-in-Size-2N-Array.md b/website/content/ChapterFour/0900~0999/0961.N-Repeated-Element-in-Size-2N-Array.md
similarity index 100%
rename from website/content/ChapterFour/0961.N-Repeated-Element-in-Size-2N-Array.md
rename to website/content/ChapterFour/0900~0999/0961.N-Repeated-Element-in-Size-2N-Array.md
diff --git a/website/content/ChapterFour/0968.Binary-Tree-Cameras.md b/website/content/ChapterFour/0900~0999/0968.Binary-Tree-Cameras.md
similarity index 100%
rename from website/content/ChapterFour/0968.Binary-Tree-Cameras.md
rename to website/content/ChapterFour/0900~0999/0968.Binary-Tree-Cameras.md
diff --git a/website/content/ChapterFour/0969.Pancake-Sorting.md b/website/content/ChapterFour/0900~0999/0969.Pancake-Sorting.md
similarity index 100%
rename from website/content/ChapterFour/0969.Pancake-Sorting.md
rename to website/content/ChapterFour/0900~0999/0969.Pancake-Sorting.md
diff --git a/website/content/ChapterFour/0970.Powerful-Integers.md b/website/content/ChapterFour/0900~0999/0970.Powerful-Integers.md
similarity index 100%
rename from website/content/ChapterFour/0970.Powerful-Integers.md
rename to website/content/ChapterFour/0900~0999/0970.Powerful-Integers.md
diff --git a/website/content/ChapterFour/0973.K-Closest-Points-to-Origin.md b/website/content/ChapterFour/0900~0999/0973.K-Closest-Points-to-Origin.md
similarity index 100%
rename from website/content/ChapterFour/0973.K-Closest-Points-to-Origin.md
rename to website/content/ChapterFour/0900~0999/0973.K-Closest-Points-to-Origin.md
diff --git a/website/content/ChapterFour/0976.Largest-Perimeter-Triangle.md b/website/content/ChapterFour/0900~0999/0976.Largest-Perimeter-Triangle.md
similarity index 100%
rename from website/content/ChapterFour/0976.Largest-Perimeter-Triangle.md
rename to website/content/ChapterFour/0900~0999/0976.Largest-Perimeter-Triangle.md
diff --git a/website/content/ChapterFour/0977.Squares-of-a-Sorted-Array.md b/website/content/ChapterFour/0900~0999/0977.Squares-of-a-Sorted-Array.md
similarity index 100%
rename from website/content/ChapterFour/0977.Squares-of-a-Sorted-Array.md
rename to website/content/ChapterFour/0900~0999/0977.Squares-of-a-Sorted-Array.md
diff --git a/website/content/ChapterFour/0978.Longest-Turbulent-Subarray.md b/website/content/ChapterFour/0900~0999/0978.Longest-Turbulent-Subarray.md
similarity index 100%
rename from website/content/ChapterFour/0978.Longest-Turbulent-Subarray.md
rename to website/content/ChapterFour/0900~0999/0978.Longest-Turbulent-Subarray.md
diff --git a/website/content/ChapterFour/0979.Distribute-Coins-in-Binary-Tree.md b/website/content/ChapterFour/0900~0999/0979.Distribute-Coins-in-Binary-Tree.md
similarity index 100%
rename from website/content/ChapterFour/0979.Distribute-Coins-in-Binary-Tree.md
rename to website/content/ChapterFour/0900~0999/0979.Distribute-Coins-in-Binary-Tree.md
diff --git a/website/content/ChapterFour/0980.Unique-Paths-III.md b/website/content/ChapterFour/0900~0999/0980.Unique-Paths-III.md
similarity index 100%
rename from website/content/ChapterFour/0980.Unique-Paths-III.md
rename to website/content/ChapterFour/0900~0999/0980.Unique-Paths-III.md
diff --git a/website/content/ChapterFour/0981.Time-Based-Key-Value-Store.md b/website/content/ChapterFour/0900~0999/0981.Time-Based-Key-Value-Store.md
similarity index 100%
rename from website/content/ChapterFour/0981.Time-Based-Key-Value-Store.md
rename to website/content/ChapterFour/0900~0999/0981.Time-Based-Key-Value-Store.md
diff --git a/website/content/ChapterFour/0984.String-Without-AAA-or-BBB.md b/website/content/ChapterFour/0900~0999/0984.String-Without-AAA-or-BBB.md
similarity index 100%
rename from website/content/ChapterFour/0984.String-Without-AAA-or-BBB.md
rename to website/content/ChapterFour/0900~0999/0984.String-Without-AAA-or-BBB.md
diff --git a/website/content/ChapterFour/0985.Sum-of-Even-Numbers-After-Queries.md b/website/content/ChapterFour/0900~0999/0985.Sum-of-Even-Numbers-After-Queries.md
similarity index 100%
rename from website/content/ChapterFour/0985.Sum-of-Even-Numbers-After-Queries.md
rename to website/content/ChapterFour/0900~0999/0985.Sum-of-Even-Numbers-After-Queries.md
diff --git a/website/content/ChapterFour/0986.Interval-List-Intersections.md b/website/content/ChapterFour/0900~0999/0986.Interval-List-Intersections.md
similarity index 100%
rename from website/content/ChapterFour/0986.Interval-List-Intersections.md
rename to website/content/ChapterFour/0900~0999/0986.Interval-List-Intersections.md
diff --git a/website/content/ChapterFour/0989.Add-to-Array-Form-of-Integer.md b/website/content/ChapterFour/0900~0999/0989.Add-to-Array-Form-of-Integer.md
similarity index 100%
rename from website/content/ChapterFour/0989.Add-to-Array-Form-of-Integer.md
rename to website/content/ChapterFour/0900~0999/0989.Add-to-Array-Form-of-Integer.md
diff --git a/website/content/ChapterFour/0990.Satisfiability-of-Equality-Equations.md b/website/content/ChapterFour/0900~0999/0990.Satisfiability-of-Equality-Equations.md
similarity index 100%
rename from website/content/ChapterFour/0990.Satisfiability-of-Equality-Equations.md
rename to website/content/ChapterFour/0900~0999/0990.Satisfiability-of-Equality-Equations.md
diff --git a/website/content/ChapterFour/0992.Subarrays-with-K-Different-Integers.md b/website/content/ChapterFour/0900~0999/0992.Subarrays-with-K-Different-Integers.md
similarity index 100%
rename from website/content/ChapterFour/0992.Subarrays-with-K-Different-Integers.md
rename to website/content/ChapterFour/0900~0999/0992.Subarrays-with-K-Different-Integers.md
diff --git a/website/content/ChapterFour/0993.Cousins-in-Binary-Tree.md b/website/content/ChapterFour/0900~0999/0993.Cousins-in-Binary-Tree.md
similarity index 100%
rename from website/content/ChapterFour/0993.Cousins-in-Binary-Tree.md
rename to website/content/ChapterFour/0900~0999/0993.Cousins-in-Binary-Tree.md
diff --git a/website/content/ChapterFour/0995.Minimum-Number-of-K-Consecutive-Bit-Flips.md b/website/content/ChapterFour/0900~0999/0995.Minimum-Number-of-K-Consecutive-Bit-Flips.md
similarity index 100%
rename from website/content/ChapterFour/0995.Minimum-Number-of-K-Consecutive-Bit-Flips.md
rename to website/content/ChapterFour/0900~0999/0995.Minimum-Number-of-K-Consecutive-Bit-Flips.md
diff --git a/website/content/ChapterFour/0996.Number-of-Squareful-Arrays.md b/website/content/ChapterFour/0900~0999/0996.Number-of-Squareful-Arrays.md
similarity index 100%
rename from website/content/ChapterFour/0996.Number-of-Squareful-Arrays.md
rename to website/content/ChapterFour/0900~0999/0996.Number-of-Squareful-Arrays.md
diff --git a/website/content/ChapterFour/0999.Available-Captures-for-Rook.md b/website/content/ChapterFour/0900~0999/0999.Available-Captures-for-Rook.md
similarity index 100%
rename from website/content/ChapterFour/0999.Available-Captures-for-Rook.md
rename to website/content/ChapterFour/0900~0999/0999.Available-Captures-for-Rook.md
diff --git a/website/content/ChapterFour/0900~0999/_index.md b/website/content/ChapterFour/0900~0999/_index.md
new file mode 100644
index 000000000..d2021683f
--- /dev/null
+++ b/website/content/ChapterFour/0900~0999/_index.md
@@ -0,0 +1,5 @@
+---
+bookCollapseSection: true
+weight: 20
+---
+
diff --git a/website/content/ChapterFour/1002.Find-Common-Characters.md b/website/content/ChapterFour/1000~1099/1002.Find-Common-Characters.md
similarity index 100%
rename from website/content/ChapterFour/1002.Find-Common-Characters.md
rename to website/content/ChapterFour/1000~1099/1002.Find-Common-Characters.md
diff --git a/website/content/ChapterFour/1003.Check-If-Word-Is-Valid-After-Substitutions.md b/website/content/ChapterFour/1000~1099/1003.Check-If-Word-Is-Valid-After-Substitutions.md
similarity index 100%
rename from website/content/ChapterFour/1003.Check-If-Word-Is-Valid-After-Substitutions.md
rename to website/content/ChapterFour/1000~1099/1003.Check-If-Word-Is-Valid-After-Substitutions.md
diff --git a/website/content/ChapterFour/1004.Max-Consecutive-Ones-III.md b/website/content/ChapterFour/1000~1099/1004.Max-Consecutive-Ones-III.md
similarity index 100%
rename from website/content/ChapterFour/1004.Max-Consecutive-Ones-III.md
rename to website/content/ChapterFour/1000~1099/1004.Max-Consecutive-Ones-III.md
diff --git a/website/content/ChapterFour/1005.Maximize-Sum-Of-Array-After-K-Negations.md b/website/content/ChapterFour/1000~1099/1005.Maximize-Sum-Of-Array-After-K-Negations.md
similarity index 100%
rename from website/content/ChapterFour/1005.Maximize-Sum-Of-Array-After-K-Negations.md
rename to website/content/ChapterFour/1000~1099/1005.Maximize-Sum-Of-Array-After-K-Negations.md
diff --git a/website/content/ChapterFour/1011.Capacity-To-Ship-Packages-Within-D-Days.md b/website/content/ChapterFour/1000~1099/1011.Capacity-To-Ship-Packages-Within-D-Days.md
similarity index 100%
rename from website/content/ChapterFour/1011.Capacity-To-Ship-Packages-Within-D-Days.md
rename to website/content/ChapterFour/1000~1099/1011.Capacity-To-Ship-Packages-Within-D-Days.md
diff --git a/website/content/ChapterFour/1017.Convert-to-Base--2.md b/website/content/ChapterFour/1000~1099/1017.Convert-to-Base--2.md
similarity index 100%
rename from website/content/ChapterFour/1017.Convert-to-Base--2.md
rename to website/content/ChapterFour/1000~1099/1017.Convert-to-Base--2.md
diff --git a/website/content/ChapterFour/1018.Binary-Prefix-Divisible-By-5.md b/website/content/ChapterFour/1000~1099/1018.Binary-Prefix-Divisible-By-5.md
similarity index 100%
rename from website/content/ChapterFour/1018.Binary-Prefix-Divisible-By-5.md
rename to website/content/ChapterFour/1000~1099/1018.Binary-Prefix-Divisible-By-5.md
diff --git a/website/content/ChapterFour/1019.Next-Greater-Node-In-Linked-List.md b/website/content/ChapterFour/1000~1099/1019.Next-Greater-Node-In-Linked-List.md
similarity index 100%
rename from website/content/ChapterFour/1019.Next-Greater-Node-In-Linked-List.md
rename to website/content/ChapterFour/1000~1099/1019.Next-Greater-Node-In-Linked-List.md
diff --git a/website/content/ChapterFour/1020.Number-of-Enclaves.md b/website/content/ChapterFour/1000~1099/1020.Number-of-Enclaves.md
similarity index 100%
rename from website/content/ChapterFour/1020.Number-of-Enclaves.md
rename to website/content/ChapterFour/1000~1099/1020.Number-of-Enclaves.md
diff --git a/website/content/ChapterFour/1021.Remove-Outermost-Parentheses.md b/website/content/ChapterFour/1000~1099/1021.Remove-Outermost-Parentheses.md
similarity index 100%
rename from website/content/ChapterFour/1021.Remove-Outermost-Parentheses.md
rename to website/content/ChapterFour/1000~1099/1021.Remove-Outermost-Parentheses.md
diff --git a/website/content/ChapterFour/1025.Divisor-Game.md b/website/content/ChapterFour/1000~1099/1025.Divisor-Game.md
similarity index 100%
rename from website/content/ChapterFour/1025.Divisor-Game.md
rename to website/content/ChapterFour/1000~1099/1025.Divisor-Game.md
diff --git a/website/content/ChapterFour/1026.Maximum-Difference-Between-Node-and-Ancestor.md b/website/content/ChapterFour/1000~1099/1026.Maximum-Difference-Between-Node-and-Ancestor.md
similarity index 100%
rename from website/content/ChapterFour/1026.Maximum-Difference-Between-Node-and-Ancestor.md
rename to website/content/ChapterFour/1000~1099/1026.Maximum-Difference-Between-Node-and-Ancestor.md
diff --git a/website/content/ChapterFour/1028.Recover-a-Tree-From-Preorder-Traversal.md b/website/content/ChapterFour/1000~1099/1028.Recover-a-Tree-From-Preorder-Traversal.md
similarity index 100%
rename from website/content/ChapterFour/1028.Recover-a-Tree-From-Preorder-Traversal.md
rename to website/content/ChapterFour/1000~1099/1028.Recover-a-Tree-From-Preorder-Traversal.md
diff --git a/website/content/ChapterFour/1030.Matrix-Cells-in-Distance-Order.md b/website/content/ChapterFour/1000~1099/1030.Matrix-Cells-in-Distance-Order.md
similarity index 100%
rename from website/content/ChapterFour/1030.Matrix-Cells-in-Distance-Order.md
rename to website/content/ChapterFour/1000~1099/1030.Matrix-Cells-in-Distance-Order.md
diff --git a/website/content/ChapterFour/1037.Valid-Boomerang.md b/website/content/ChapterFour/1000~1099/1037.Valid-Boomerang.md
similarity index 100%
rename from website/content/ChapterFour/1037.Valid-Boomerang.md
rename to website/content/ChapterFour/1000~1099/1037.Valid-Boomerang.md
diff --git a/website/content/ChapterFour/1040.Moving-Stones-Until-Consecutive-II.md b/website/content/ChapterFour/1000~1099/1040.Moving-Stones-Until-Consecutive-II.md
similarity index 100%
rename from website/content/ChapterFour/1040.Moving-Stones-Until-Consecutive-II.md
rename to website/content/ChapterFour/1000~1099/1040.Moving-Stones-Until-Consecutive-II.md
diff --git a/website/content/ChapterFour/1047.Remove-All-Adjacent-Duplicates-In-String.md b/website/content/ChapterFour/1000~1099/1047.Remove-All-Adjacent-Duplicates-In-String.md
similarity index 100%
rename from website/content/ChapterFour/1047.Remove-All-Adjacent-Duplicates-In-String.md
rename to website/content/ChapterFour/1000~1099/1047.Remove-All-Adjacent-Duplicates-In-String.md
diff --git a/website/content/ChapterFour/1049.Last-Stone-Weight-II.md b/website/content/ChapterFour/1000~1099/1049.Last-Stone-Weight-II.md
similarity index 100%
rename from website/content/ChapterFour/1049.Last-Stone-Weight-II.md
rename to website/content/ChapterFour/1000~1099/1049.Last-Stone-Weight-II.md
diff --git a/website/content/ChapterFour/1051.Height-Checker.md b/website/content/ChapterFour/1000~1099/1051.Height-Checker.md
similarity index 100%
rename from website/content/ChapterFour/1051.Height-Checker.md
rename to website/content/ChapterFour/1000~1099/1051.Height-Checker.md
diff --git a/website/content/ChapterFour/1052.Grumpy-Bookstore-Owner.md b/website/content/ChapterFour/1000~1099/1052.Grumpy-Bookstore-Owner.md
similarity index 100%
rename from website/content/ChapterFour/1052.Grumpy-Bookstore-Owner.md
rename to website/content/ChapterFour/1000~1099/1052.Grumpy-Bookstore-Owner.md
diff --git a/website/content/ChapterFour/1054.Distant-Barcodes.md b/website/content/ChapterFour/1000~1099/1054.Distant-Barcodes.md
similarity index 100%
rename from website/content/ChapterFour/1054.Distant-Barcodes.md
rename to website/content/ChapterFour/1000~1099/1054.Distant-Barcodes.md
diff --git a/website/content/ChapterFour/1073.Adding-Two-Negabinary-Numbers.md b/website/content/ChapterFour/1000~1099/1073.Adding-Two-Negabinary-Numbers.md
similarity index 100%
rename from website/content/ChapterFour/1073.Adding-Two-Negabinary-Numbers.md
rename to website/content/ChapterFour/1000~1099/1073.Adding-Two-Negabinary-Numbers.md
diff --git a/website/content/ChapterFour/1074.Number-of-Submatrices-That-Sum-to-Target.md b/website/content/ChapterFour/1000~1099/1074.Number-of-Submatrices-That-Sum-to-Target.md
similarity index 100%
rename from website/content/ChapterFour/1074.Number-of-Submatrices-That-Sum-to-Target.md
rename to website/content/ChapterFour/1000~1099/1074.Number-of-Submatrices-That-Sum-to-Target.md
diff --git a/website/content/ChapterFour/1078.Occurrences-After-Bigram.md b/website/content/ChapterFour/1000~1099/1078.Occurrences-After-Bigram.md
similarity index 100%
rename from website/content/ChapterFour/1078.Occurrences-After-Bigram.md
rename to website/content/ChapterFour/1000~1099/1078.Occurrences-After-Bigram.md
diff --git a/website/content/ChapterFour/1079.Letter-Tile-Possibilities.md b/website/content/ChapterFour/1000~1099/1079.Letter-Tile-Possibilities.md
similarity index 100%
rename from website/content/ChapterFour/1079.Letter-Tile-Possibilities.md
rename to website/content/ChapterFour/1000~1099/1079.Letter-Tile-Possibilities.md
diff --git a/website/content/ChapterFour/1089.Duplicate-Zeros.md b/website/content/ChapterFour/1000~1099/1089.Duplicate-Zeros.md
similarity index 100%
rename from website/content/ChapterFour/1089.Duplicate-Zeros.md
rename to website/content/ChapterFour/1000~1099/1089.Duplicate-Zeros.md
diff --git a/website/content/ChapterFour/1093.Statistics-from-a-Large-Sample.md b/website/content/ChapterFour/1000~1099/1093.Statistics-from-a-Large-Sample.md
similarity index 100%
rename from website/content/ChapterFour/1093.Statistics-from-a-Large-Sample.md
rename to website/content/ChapterFour/1000~1099/1093.Statistics-from-a-Large-Sample.md
diff --git a/website/content/ChapterFour/1000~1099/_index.md b/website/content/ChapterFour/1000~1099/_index.md
new file mode 100644
index 000000000..d2021683f
--- /dev/null
+++ b/website/content/ChapterFour/1000~1099/_index.md
@@ -0,0 +1,5 @@
+---
+bookCollapseSection: true
+weight: 20
+---
+
diff --git a/website/content/ChapterFour/1105.Filling-Bookcase-Shelves.md b/website/content/ChapterFour/1100~1199/1105.Filling-Bookcase-Shelves.md
similarity index 100%
rename from website/content/ChapterFour/1105.Filling-Bookcase-Shelves.md
rename to website/content/ChapterFour/1100~1199/1105.Filling-Bookcase-Shelves.md
diff --git a/website/content/ChapterFour/1108.Defanging-an-IP-Address.md b/website/content/ChapterFour/1100~1199/1108.Defanging-an-IP-Address.md
similarity index 100%
rename from website/content/ChapterFour/1108.Defanging-an-IP-Address.md
rename to website/content/ChapterFour/1100~1199/1108.Defanging-an-IP-Address.md
diff --git a/website/content/ChapterFour/1110.Delete-Nodes-And-Return-Forest.md b/website/content/ChapterFour/1100~1199/1110.Delete-Nodes-And-Return-Forest.md
similarity index 100%
rename from website/content/ChapterFour/1110.Delete-Nodes-And-Return-Forest.md
rename to website/content/ChapterFour/1100~1199/1110.Delete-Nodes-And-Return-Forest.md
diff --git a/website/content/ChapterFour/1111.Maximum-Nesting-Depth-of-Two-Valid-Parentheses-Strings.md b/website/content/ChapterFour/1100~1199/1111.Maximum-Nesting-Depth-of-Two-Valid-Parentheses-Strings.md
similarity index 100%
rename from website/content/ChapterFour/1111.Maximum-Nesting-Depth-of-Two-Valid-Parentheses-Strings.md
rename to website/content/ChapterFour/1100~1199/1111.Maximum-Nesting-Depth-of-Two-Valid-Parentheses-Strings.md
diff --git a/website/content/ChapterFour/1122.Relative-Sort-Array.md b/website/content/ChapterFour/1100~1199/1122.Relative-Sort-Array.md
similarity index 100%
rename from website/content/ChapterFour/1122.Relative-Sort-Array.md
rename to website/content/ChapterFour/1100~1199/1122.Relative-Sort-Array.md
diff --git a/website/content/ChapterFour/1123.Lowest-Common-Ancestor-of-Deepest-Leaves.md b/website/content/ChapterFour/1100~1199/1123.Lowest-Common-Ancestor-of-Deepest-Leaves.md
similarity index 100%
rename from website/content/ChapterFour/1123.Lowest-Common-Ancestor-of-Deepest-Leaves.md
rename to website/content/ChapterFour/1100~1199/1123.Lowest-Common-Ancestor-of-Deepest-Leaves.md
diff --git a/website/content/ChapterFour/1128.Number-of-Equivalent-Domino-Pairs.md b/website/content/ChapterFour/1100~1199/1128.Number-of-Equivalent-Domino-Pairs.md
similarity index 100%
rename from website/content/ChapterFour/1128.Number-of-Equivalent-Domino-Pairs.md
rename to website/content/ChapterFour/1100~1199/1128.Number-of-Equivalent-Domino-Pairs.md
diff --git a/website/content/ChapterFour/1137.N-th-Tribonacci-Number.md b/website/content/ChapterFour/1100~1199/1137.N-th-Tribonacci-Number.md
similarity index 100%
rename from website/content/ChapterFour/1137.N-th-Tribonacci-Number.md
rename to website/content/ChapterFour/1100~1199/1137.N-th-Tribonacci-Number.md
diff --git a/website/content/ChapterFour/1145.Binary-Tree-Coloring-Game.md b/website/content/ChapterFour/1100~1199/1145.Binary-Tree-Coloring-Game.md
similarity index 100%
rename from website/content/ChapterFour/1145.Binary-Tree-Coloring-Game.md
rename to website/content/ChapterFour/1100~1199/1145.Binary-Tree-Coloring-Game.md
diff --git a/website/content/ChapterFour/1154.Day-of-the-Year.md b/website/content/ChapterFour/1100~1199/1154.Day-of-the-Year.md
similarity index 100%
rename from website/content/ChapterFour/1154.Day-of-the-Year.md
rename to website/content/ChapterFour/1100~1199/1154.Day-of-the-Year.md
diff --git a/website/content/ChapterFour/1157.Online-Majority-Element-In-Subarray.md b/website/content/ChapterFour/1100~1199/1157.Online-Majority-Element-In-Subarray.md
similarity index 100%
rename from website/content/ChapterFour/1157.Online-Majority-Element-In-Subarray.md
rename to website/content/ChapterFour/1100~1199/1157.Online-Majority-Element-In-Subarray.md
diff --git a/website/content/ChapterFour/1160.Find-Words-That-Can-Be-Formed-by-Characters.md b/website/content/ChapterFour/1100~1199/1160.Find-Words-That-Can-Be-Formed-by-Characters.md
similarity index 100%
rename from website/content/ChapterFour/1160.Find-Words-That-Can-Be-Formed-by-Characters.md
rename to website/content/ChapterFour/1100~1199/1160.Find-Words-That-Can-Be-Formed-by-Characters.md
diff --git a/website/content/ChapterFour/1170.Compare-Strings-by-Frequency-of-the-Smallest-Character.md b/website/content/ChapterFour/1100~1199/1170.Compare-Strings-by-Frequency-of-the-Smallest-Character.md
similarity index 100%
rename from website/content/ChapterFour/1170.Compare-Strings-by-Frequency-of-the-Smallest-Character.md
rename to website/content/ChapterFour/1100~1199/1170.Compare-Strings-by-Frequency-of-the-Smallest-Character.md
diff --git a/website/content/ChapterFour/1171.Remove-Zero-Sum-Consecutive-Nodes-from-Linked-List.md b/website/content/ChapterFour/1100~1199/1171.Remove-Zero-Sum-Consecutive-Nodes-from-Linked-List.md
similarity index 100%
rename from website/content/ChapterFour/1171.Remove-Zero-Sum-Consecutive-Nodes-from-Linked-List.md
rename to website/content/ChapterFour/1100~1199/1171.Remove-Zero-Sum-Consecutive-Nodes-from-Linked-List.md
diff --git a/website/content/ChapterFour/1175.Prime-Arrangements.md b/website/content/ChapterFour/1100~1199/1175.Prime-Arrangements.md
similarity index 100%
rename from website/content/ChapterFour/1175.Prime-Arrangements.md
rename to website/content/ChapterFour/1100~1199/1175.Prime-Arrangements.md
diff --git a/website/content/ChapterFour/1184.Distance-Between-Bus-Stops.md b/website/content/ChapterFour/1100~1199/1184.Distance-Between-Bus-Stops.md
similarity index 100%
rename from website/content/ChapterFour/1184.Distance-Between-Bus-Stops.md
rename to website/content/ChapterFour/1100~1199/1184.Distance-Between-Bus-Stops.md
diff --git a/website/content/ChapterFour/1185.Day-of-the-Week.md b/website/content/ChapterFour/1100~1199/1185.Day-of-the-Week.md
similarity index 100%
rename from website/content/ChapterFour/1185.Day-of-the-Week.md
rename to website/content/ChapterFour/1100~1199/1185.Day-of-the-Week.md
diff --git a/website/content/ChapterFour/1189.Maximum-Number-of-Balloons.md b/website/content/ChapterFour/1100~1199/1189.Maximum-Number-of-Balloons.md
similarity index 100%
rename from website/content/ChapterFour/1189.Maximum-Number-of-Balloons.md
rename to website/content/ChapterFour/1100~1199/1189.Maximum-Number-of-Balloons.md
diff --git a/website/content/ChapterFour/1100~1199/_index.md b/website/content/ChapterFour/1100~1199/_index.md
new file mode 100644
index 000000000..d2021683f
--- /dev/null
+++ b/website/content/ChapterFour/1100~1199/_index.md
@@ -0,0 +1,5 @@
+---
+bookCollapseSection: true
+weight: 20
+---
+
diff --git a/website/content/ChapterFour/1200.Minimum-Absolute-Difference.md b/website/content/ChapterFour/1200~1299/1200.Minimum-Absolute-Difference.md
similarity index 100%
rename from website/content/ChapterFour/1200.Minimum-Absolute-Difference.md
rename to website/content/ChapterFour/1200~1299/1200.Minimum-Absolute-Difference.md
diff --git a/website/content/ChapterFour/1201.Ugly-Number-III.md b/website/content/ChapterFour/1200~1299/1201.Ugly-Number-III.md
similarity index 100%
rename from website/content/ChapterFour/1201.Ugly-Number-III.md
rename to website/content/ChapterFour/1200~1299/1201.Ugly-Number-III.md
diff --git a/website/content/ChapterFour/1202.Smallest-String-With-Swaps.md b/website/content/ChapterFour/1200~1299/1202.Smallest-String-With-Swaps.md
similarity index 100%
rename from website/content/ChapterFour/1202.Smallest-String-With-Swaps.md
rename to website/content/ChapterFour/1200~1299/1202.Smallest-String-With-Swaps.md
diff --git a/website/content/ChapterFour/1203.Sort-Items-by-Groups-Respecting-Dependencies.md b/website/content/ChapterFour/1200~1299/1203.Sort-Items-by-Groups-Respecting-Dependencies.md
similarity index 100%
rename from website/content/ChapterFour/1203.Sort-Items-by-Groups-Respecting-Dependencies.md
rename to website/content/ChapterFour/1200~1299/1203.Sort-Items-by-Groups-Respecting-Dependencies.md
diff --git a/website/content/ChapterFour/1207.Unique-Number-of-Occurrences.md b/website/content/ChapterFour/1200~1299/1207.Unique-Number-of-Occurrences.md
similarity index 100%
rename from website/content/ChapterFour/1207.Unique-Number-of-Occurrences.md
rename to website/content/ChapterFour/1200~1299/1207.Unique-Number-of-Occurrences.md
diff --git a/website/content/ChapterFour/1208.Get-Equal-Substrings-Within-Budget.md b/website/content/ChapterFour/1200~1299/1208.Get-Equal-Substrings-Within-Budget.md
similarity index 100%
rename from website/content/ChapterFour/1208.Get-Equal-Substrings-Within-Budget.md
rename to website/content/ChapterFour/1200~1299/1208.Get-Equal-Substrings-Within-Budget.md
diff --git a/website/content/ChapterFour/1217.Minimum-Cost-to-Move-Chips-to-The-Same-Position.md b/website/content/ChapterFour/1200~1299/1217.Minimum-Cost-to-Move-Chips-to-The-Same-Position.md
similarity index 100%
rename from website/content/ChapterFour/1217.Minimum-Cost-to-Move-Chips-to-The-Same-Position.md
rename to website/content/ChapterFour/1200~1299/1217.Minimum-Cost-to-Move-Chips-to-The-Same-Position.md
diff --git a/website/content/ChapterFour/1221.Split-a-String-in-Balanced-Strings.md b/website/content/ChapterFour/1200~1299/1221.Split-a-String-in-Balanced-Strings.md
similarity index 100%
rename from website/content/ChapterFour/1221.Split-a-String-in-Balanced-Strings.md
rename to website/content/ChapterFour/1200~1299/1221.Split-a-String-in-Balanced-Strings.md
diff --git a/website/content/ChapterFour/1232.Check-If-It-Is-a-Straight-Line.md b/website/content/ChapterFour/1200~1299/1232.Check-If-It-Is-a-Straight-Line.md
similarity index 100%
rename from website/content/ChapterFour/1232.Check-If-It-Is-a-Straight-Line.md
rename to website/content/ChapterFour/1200~1299/1232.Check-If-It-Is-a-Straight-Line.md
diff --git a/website/content/ChapterFour/1234.Replace-the-Substring-for-Balanced-String.md b/website/content/ChapterFour/1200~1299/1234.Replace-the-Substring-for-Balanced-String.md
similarity index 100%
rename from website/content/ChapterFour/1234.Replace-the-Substring-for-Balanced-String.md
rename to website/content/ChapterFour/1200~1299/1234.Replace-the-Substring-for-Balanced-String.md
diff --git a/website/content/ChapterFour/1235.Maximum-Profit-in-Job-Scheduling.md b/website/content/ChapterFour/1200~1299/1235.Maximum-Profit-in-Job-Scheduling.md
similarity index 100%
rename from website/content/ChapterFour/1235.Maximum-Profit-in-Job-Scheduling.md
rename to website/content/ChapterFour/1200~1299/1235.Maximum-Profit-in-Job-Scheduling.md
diff --git a/website/content/ChapterFour/1252.Cells-with-Odd-Values-in-a-Matrix.md b/website/content/ChapterFour/1200~1299/1252.Cells-with-Odd-Values-in-a-Matrix.md
similarity index 100%
rename from website/content/ChapterFour/1252.Cells-with-Odd-Values-in-a-Matrix.md
rename to website/content/ChapterFour/1200~1299/1252.Cells-with-Odd-Values-in-a-Matrix.md
diff --git a/website/content/ChapterFour/1254.Number-of-Closed-Islands.md b/website/content/ChapterFour/1200~1299/1254.Number-of-Closed-Islands.md
similarity index 100%
rename from website/content/ChapterFour/1254.Number-of-Closed-Islands.md
rename to website/content/ChapterFour/1200~1299/1254.Number-of-Closed-Islands.md
diff --git a/website/content/ChapterFour/1260.Shift-2D-Grid.md b/website/content/ChapterFour/1200~1299/1260.Shift-2D-Grid.md
similarity index 100%
rename from website/content/ChapterFour/1260.Shift-2D-Grid.md
rename to website/content/ChapterFour/1200~1299/1260.Shift-2D-Grid.md
diff --git a/website/content/ChapterFour/1266.Minimum-Time-Visiting-All-Points.md b/website/content/ChapterFour/1200~1299/1266.Minimum-Time-Visiting-All-Points.md
similarity index 100%
rename from website/content/ChapterFour/1266.Minimum-Time-Visiting-All-Points.md
rename to website/content/ChapterFour/1200~1299/1266.Minimum-Time-Visiting-All-Points.md
diff --git a/website/content/ChapterFour/1275.Find-Winner-on-a-Tic-Tac-Toe-Game.md b/website/content/ChapterFour/1200~1299/1275.Find-Winner-on-a-Tic-Tac-Toe-Game.md
similarity index 100%
rename from website/content/ChapterFour/1275.Find-Winner-on-a-Tic-Tac-Toe-Game.md
rename to website/content/ChapterFour/1200~1299/1275.Find-Winner-on-a-Tic-Tac-Toe-Game.md
diff --git a/website/content/ChapterFour/1281.Subtract-the-Product-and-Sum-of-Digits-of-an-Integer.md b/website/content/ChapterFour/1200~1299/1281.Subtract-the-Product-and-Sum-of-Digits-of-an-Integer.md
similarity index 100%
rename from website/content/ChapterFour/1281.Subtract-the-Product-and-Sum-of-Digits-of-an-Integer.md
rename to website/content/ChapterFour/1200~1299/1281.Subtract-the-Product-and-Sum-of-Digits-of-an-Integer.md
diff --git a/website/content/ChapterFour/1283.Find-the-Smallest-Divisor-Given-a-Threshold.md b/website/content/ChapterFour/1200~1299/1283.Find-the-Smallest-Divisor-Given-a-Threshold.md
similarity index 100%
rename from website/content/ChapterFour/1283.Find-the-Smallest-Divisor-Given-a-Threshold.md
rename to website/content/ChapterFour/1200~1299/1283.Find-the-Smallest-Divisor-Given-a-Threshold.md
diff --git a/website/content/ChapterFour/1287.Element-Appearing-More-Than-25-In-Sorted-Array.md b/website/content/ChapterFour/1200~1299/1287.Element-Appearing-More-Than-25-In-Sorted-Array.md
similarity index 100%
rename from website/content/ChapterFour/1287.Element-Appearing-More-Than-25-In-Sorted-Array.md
rename to website/content/ChapterFour/1200~1299/1287.Element-Appearing-More-Than-25-In-Sorted-Array.md
diff --git a/website/content/ChapterFour/1290.Convert-Binary-Number-in-a-Linked-List-to-Integer.md b/website/content/ChapterFour/1200~1299/1290.Convert-Binary-Number-in-a-Linked-List-to-Integer.md
similarity index 100%
rename from website/content/ChapterFour/1290.Convert-Binary-Number-in-a-Linked-List-to-Integer.md
rename to website/content/ChapterFour/1200~1299/1290.Convert-Binary-Number-in-a-Linked-List-to-Integer.md
diff --git a/website/content/ChapterFour/1295.Find-Numbers-with-Even-Number-of-Digits.md b/website/content/ChapterFour/1200~1299/1295.Find-Numbers-with-Even-Number-of-Digits.md
similarity index 100%
rename from website/content/ChapterFour/1295.Find-Numbers-with-Even-Number-of-Digits.md
rename to website/content/ChapterFour/1200~1299/1295.Find-Numbers-with-Even-Number-of-Digits.md
diff --git a/website/content/ChapterFour/1299.Replace-Elements-with-Greatest-Element-on-Right-Side.md b/website/content/ChapterFour/1200~1299/1299.Replace-Elements-with-Greatest-Element-on-Right-Side.md
similarity index 100%
rename from website/content/ChapterFour/1299.Replace-Elements-with-Greatest-Element-on-Right-Side.md
rename to website/content/ChapterFour/1200~1299/1299.Replace-Elements-with-Greatest-Element-on-Right-Side.md
diff --git a/website/content/ChapterFour/1200~1299/_index.md b/website/content/ChapterFour/1200~1299/_index.md
new file mode 100644
index 000000000..d2021683f
--- /dev/null
+++ b/website/content/ChapterFour/1200~1299/_index.md
@@ -0,0 +1,5 @@
+---
+bookCollapseSection: true
+weight: 20
+---
+
diff --git a/website/content/ChapterFour/1300.Sum-of-Mutated-Array-Closest-to-Target.md b/website/content/ChapterFour/1300~1399/1300.Sum-of-Mutated-Array-Closest-to-Target.md
similarity index 100%
rename from website/content/ChapterFour/1300.Sum-of-Mutated-Array-Closest-to-Target.md
rename to website/content/ChapterFour/1300~1399/1300.Sum-of-Mutated-Array-Closest-to-Target.md
diff --git a/website/content/ChapterFour/1302.Deepest-Leaves-Sum.md b/website/content/ChapterFour/1300~1399/1302.Deepest-Leaves-Sum.md
similarity index 100%
rename from website/content/ChapterFour/1302.Deepest-Leaves-Sum.md
rename to website/content/ChapterFour/1300~1399/1302.Deepest-Leaves-Sum.md
diff --git a/website/content/ChapterFour/1304.Find-N-Unique-Integers-Sum-up-to-Zero.md b/website/content/ChapterFour/1300~1399/1304.Find-N-Unique-Integers-Sum-up-to-Zero.md
similarity index 100%
rename from website/content/ChapterFour/1304.Find-N-Unique-Integers-Sum-up-to-Zero.md
rename to website/content/ChapterFour/1300~1399/1304.Find-N-Unique-Integers-Sum-up-to-Zero.md
diff --git a/website/content/ChapterFour/1305.All-Elements-in-Two-Binary-Search-Trees.md b/website/content/ChapterFour/1300~1399/1305.All-Elements-in-Two-Binary-Search-Trees.md
similarity index 100%
rename from website/content/ChapterFour/1305.All-Elements-in-Two-Binary-Search-Trees.md
rename to website/content/ChapterFour/1300~1399/1305.All-Elements-in-Two-Binary-Search-Trees.md
diff --git a/website/content/ChapterFour/1306.Jump-Game-III.md b/website/content/ChapterFour/1300~1399/1306.Jump-Game-III.md
similarity index 100%
rename from website/content/ChapterFour/1306.Jump-Game-III.md
rename to website/content/ChapterFour/1300~1399/1306.Jump-Game-III.md
diff --git a/website/content/ChapterFour/1313.Decompress-Run-Length-Encoded-List.md b/website/content/ChapterFour/1300~1399/1313.Decompress-Run-Length-Encoded-List.md
similarity index 100%
rename from website/content/ChapterFour/1313.Decompress-Run-Length-Encoded-List.md
rename to website/content/ChapterFour/1300~1399/1313.Decompress-Run-Length-Encoded-List.md
diff --git a/website/content/ChapterFour/1317.Convert-Integer-to-the-Sum-of-Two-No-Zero-Integers.md b/website/content/ChapterFour/1300~1399/1317.Convert-Integer-to-the-Sum-of-Two-No-Zero-Integers.md
similarity index 100%
rename from website/content/ChapterFour/1317.Convert-Integer-to-the-Sum-of-Two-No-Zero-Integers.md
rename to website/content/ChapterFour/1300~1399/1317.Convert-Integer-to-the-Sum-of-Two-No-Zero-Integers.md
diff --git a/website/content/ChapterFour/1319.Number-of-Operations-to-Make-Network-Connected.md b/website/content/ChapterFour/1300~1399/1319.Number-of-Operations-to-Make-Network-Connected.md
similarity index 100%
rename from website/content/ChapterFour/1319.Number-of-Operations-to-Make-Network-Connected.md
rename to website/content/ChapterFour/1300~1399/1319.Number-of-Operations-to-Make-Network-Connected.md
diff --git a/website/content/ChapterFour/1329.Sort-the-Matrix-Diagonally.md b/website/content/ChapterFour/1300~1399/1329.Sort-the-Matrix-Diagonally.md
similarity index 100%
rename from website/content/ChapterFour/1329.Sort-the-Matrix-Diagonally.md
rename to website/content/ChapterFour/1300~1399/1329.Sort-the-Matrix-Diagonally.md
diff --git a/website/content/ChapterFour/1380.Lucky-Numbers-in-a-Matrix.md b/website/content/ChapterFour/1300~1399/1380.Lucky-Numbers-in-a-Matrix.md
similarity index 100%
rename from website/content/ChapterFour/1380.Lucky-Numbers-in-a-Matrix.md
rename to website/content/ChapterFour/1300~1399/1380.Lucky-Numbers-in-a-Matrix.md
diff --git a/website/content/ChapterFour/1385.Find-the-Distance-Value-Between-Two-Arrays.md b/website/content/ChapterFour/1300~1399/1385.Find-the-Distance-Value-Between-Two-Arrays.md
similarity index 100%
rename from website/content/ChapterFour/1385.Find-the-Distance-Value-Between-Two-Arrays.md
rename to website/content/ChapterFour/1300~1399/1385.Find-the-Distance-Value-Between-Two-Arrays.md
diff --git a/website/content/ChapterFour/1389.Create-Target-Array-in-the-Given-Order.md b/website/content/ChapterFour/1300~1399/1389.Create-Target-Array-in-the-Given-Order.md
similarity index 100%
rename from website/content/ChapterFour/1389.Create-Target-Array-in-the-Given-Order.md
rename to website/content/ChapterFour/1300~1399/1389.Create-Target-Array-in-the-Given-Order.md
diff --git a/website/content/ChapterFour/1300~1399/_index.md b/website/content/ChapterFour/1300~1399/_index.md
new file mode 100644
index 000000000..d2021683f
--- /dev/null
+++ b/website/content/ChapterFour/1300~1399/_index.md
@@ -0,0 +1,5 @@
+---
+bookCollapseSection: true
+weight: 20
+---
+
diff --git a/website/content/ChapterFour/1437.Check-If-All-1s-Are-at-Least-Length-K-Places-Away.md b/website/content/ChapterFour/1400~1499/1437.Check-If-All-1s-Are-at-Least-Length-K-Places-Away.md
similarity index 100%
rename from website/content/ChapterFour/1437.Check-If-All-1s-Are-at-Least-Length-K-Places-Away.md
rename to website/content/ChapterFour/1400~1499/1437.Check-If-All-1s-Are-at-Least-Length-K-Places-Away.md
diff --git a/website/content/ChapterFour/1455.Check-If-a-Word-Occurs-As-a-Prefix-of-Any-Word-in-a-Sentence.md b/website/content/ChapterFour/1400~1499/1455.Check-If-a-Word-Occurs-As-a-Prefix-of-Any-Word-in-a-Sentence.md
similarity index 100%
rename from website/content/ChapterFour/1455.Check-If-a-Word-Occurs-As-a-Prefix-of-Any-Word-in-a-Sentence.md
rename to website/content/ChapterFour/1400~1499/1455.Check-If-a-Word-Occurs-As-a-Prefix-of-Any-Word-in-a-Sentence.md
diff --git a/website/content/ChapterFour/1463.Cherry-Pickup-II.md b/website/content/ChapterFour/1400~1499/1463.Cherry-Pickup-II.md
similarity index 100%
rename from website/content/ChapterFour/1463.Cherry-Pickup-II.md
rename to website/content/ChapterFour/1400~1499/1463.Cherry-Pickup-II.md
diff --git a/website/content/ChapterFour/1464.Maximum-Product-of-Two-Elements-in-an-Array.md b/website/content/ChapterFour/1400~1499/1464.Maximum-Product-of-Two-Elements-in-an-Array.md
similarity index 100%
rename from website/content/ChapterFour/1464.Maximum-Product-of-Two-Elements-in-an-Array.md
rename to website/content/ChapterFour/1400~1499/1464.Maximum-Product-of-Two-Elements-in-an-Array.md
diff --git a/website/content/ChapterFour/1470.Shuffle-the-Array.md b/website/content/ChapterFour/1400~1499/1470.Shuffle-the-Array.md
similarity index 100%
rename from website/content/ChapterFour/1470.Shuffle-the-Array.md
rename to website/content/ChapterFour/1400~1499/1470.Shuffle-the-Array.md
diff --git a/website/content/ChapterFour/1480.Running-Sum-of-1d-Array.md b/website/content/ChapterFour/1400~1499/1480.Running-Sum-of-1d-Array.md
similarity index 100%
rename from website/content/ChapterFour/1480.Running-Sum-of-1d-Array.md
rename to website/content/ChapterFour/1400~1499/1480.Running-Sum-of-1d-Array.md
diff --git a/website/content/ChapterFour/1400~1499/_index.md b/website/content/ChapterFour/1400~1499/_index.md
new file mode 100644
index 000000000..d2021683f
--- /dev/null
+++ b/website/content/ChapterFour/1400~1499/_index.md
@@ -0,0 +1,5 @@
+---
+bookCollapseSection: true
+weight: 20
+---
+
diff --git a/website/content/ChapterFour/1512.Number-of-Good-Pairs.md b/website/content/ChapterFour/1500~1599/1512.Number-of-Good-Pairs.md
similarity index 100%
rename from website/content/ChapterFour/1512.Number-of-Good-Pairs.md
rename to website/content/ChapterFour/1500~1599/1512.Number-of-Good-Pairs.md
diff --git a/website/content/ChapterFour/1539.Kth-Missing-Positive-Number.md b/website/content/ChapterFour/1500~1599/1539.Kth-Missing-Positive-Number.md
similarity index 100%
rename from website/content/ChapterFour/1539.Kth-Missing-Positive-Number.md
rename to website/content/ChapterFour/1500~1599/1539.Kth-Missing-Positive-Number.md
diff --git a/website/content/ChapterFour/1573.Number-of-Ways-to-Split-a-String.md b/website/content/ChapterFour/1500~1599/1573.Number-of-Ways-to-Split-a-String.md
similarity index 100%
rename from website/content/ChapterFour/1573.Number-of-Ways-to-Split-a-String.md
rename to website/content/ChapterFour/1500~1599/1573.Number-of-Ways-to-Split-a-String.md
diff --git a/website/content/ChapterFour/1500~1599/_index.md b/website/content/ChapterFour/1500~1599/_index.md
new file mode 100644
index 000000000..d2021683f
--- /dev/null
+++ b/website/content/ChapterFour/1500~1599/_index.md
@@ -0,0 +1,5 @@
+---
+bookCollapseSection: true
+weight: 20
+---
+
diff --git a/website/content/ChapterFour/1640.Check-Array-Formation-Through-Concatenation.md b/website/content/ChapterFour/1600~1699/1640.Check-Array-Formation-Through-Concatenation.md
similarity index 100%
rename from website/content/ChapterFour/1640.Check-Array-Formation-Through-Concatenation.md
rename to website/content/ChapterFour/1600~1699/1640.Check-Array-Formation-Through-Concatenation.md
diff --git a/website/content/ChapterFour/1641.Count-Sorted-Vowel-Strings.md b/website/content/ChapterFour/1600~1699/1641.Count-Sorted-Vowel-Strings.md
similarity index 100%
rename from website/content/ChapterFour/1641.Count-Sorted-Vowel-Strings.md
rename to website/content/ChapterFour/1600~1699/1641.Count-Sorted-Vowel-Strings.md
diff --git a/website/content/ChapterFour/1646.Get-Maximum-in-Generated-Array.md b/website/content/ChapterFour/1600~1699/1646.Get-Maximum-in-Generated-Array.md
similarity index 100%
rename from website/content/ChapterFour/1646.Get-Maximum-in-Generated-Array.md
rename to website/content/ChapterFour/1600~1699/1646.Get-Maximum-in-Generated-Array.md
diff --git a/website/content/ChapterFour/1647.Minimum-Deletions-to-Make-Character-Frequencies-Unique.md b/website/content/ChapterFour/1600~1699/1647.Minimum-Deletions-to-Make-Character-Frequencies-Unique.md
similarity index 100%
rename from website/content/ChapterFour/1647.Minimum-Deletions-to-Make-Character-Frequencies-Unique.md
rename to website/content/ChapterFour/1600~1699/1647.Minimum-Deletions-to-Make-Character-Frequencies-Unique.md
diff --git a/website/content/ChapterFour/1648.Sell-Diminishing-Valued-Colored-Balls.md b/website/content/ChapterFour/1600~1699/1648.Sell-Diminishing-Valued-Colored-Balls.md
similarity index 100%
rename from website/content/ChapterFour/1648.Sell-Diminishing-Valued-Colored-Balls.md
rename to website/content/ChapterFour/1600~1699/1648.Sell-Diminishing-Valued-Colored-Balls.md
diff --git a/website/content/ChapterFour/1649.Create-Sorted-Array-through-Instructions.md b/website/content/ChapterFour/1600~1699/1649.Create-Sorted-Array-through-Instructions.md
similarity index 100%
rename from website/content/ChapterFour/1649.Create-Sorted-Array-through-Instructions.md
rename to website/content/ChapterFour/1600~1699/1649.Create-Sorted-Array-through-Instructions.md
diff --git a/website/content/ChapterFour/1652.Defuse-the-Bomb.md b/website/content/ChapterFour/1600~1699/1652.Defuse-the-Bomb.md
similarity index 100%
rename from website/content/ChapterFour/1652.Defuse-the-Bomb.md
rename to website/content/ChapterFour/1600~1699/1652.Defuse-the-Bomb.md
diff --git a/website/content/ChapterFour/1653.Minimum-Deletions-to-Make-String-Balanced.md b/website/content/ChapterFour/1600~1699/1653.Minimum-Deletions-to-Make-String-Balanced.md
similarity index 100%
rename from website/content/ChapterFour/1653.Minimum-Deletions-to-Make-String-Balanced.md
rename to website/content/ChapterFour/1600~1699/1653.Minimum-Deletions-to-Make-String-Balanced.md
diff --git a/website/content/ChapterFour/1654.Minimum-Jumps-to-Reach-Home.md b/website/content/ChapterFour/1600~1699/1654.Minimum-Jumps-to-Reach-Home.md
similarity index 100%
rename from website/content/ChapterFour/1654.Minimum-Jumps-to-Reach-Home.md
rename to website/content/ChapterFour/1600~1699/1654.Minimum-Jumps-to-Reach-Home.md
diff --git a/website/content/ChapterFour/1655.Distribute-Repeating-Integers.md b/website/content/ChapterFour/1600~1699/1655.Distribute-Repeating-Integers.md
similarity index 100%
rename from website/content/ChapterFour/1655.Distribute-Repeating-Integers.md
rename to website/content/ChapterFour/1600~1699/1655.Distribute-Repeating-Integers.md
diff --git a/website/content/ChapterFour/1656.Design-an-Ordered-Stream.md b/website/content/ChapterFour/1600~1699/1656.Design-an-Ordered-Stream.md
similarity index 100%
rename from website/content/ChapterFour/1656.Design-an-Ordered-Stream.md
rename to website/content/ChapterFour/1600~1699/1656.Design-an-Ordered-Stream.md
diff --git a/website/content/ChapterFour/1657.Determine-if-Two-Strings-Are-Close.md b/website/content/ChapterFour/1600~1699/1657.Determine-if-Two-Strings-Are-Close.md
similarity index 100%
rename from website/content/ChapterFour/1657.Determine-if-Two-Strings-Are-Close.md
rename to website/content/ChapterFour/1600~1699/1657.Determine-if-Two-Strings-Are-Close.md
diff --git a/website/content/ChapterFour/1658.Minimum-Operations-to-Reduce-X-to-Zero.md b/website/content/ChapterFour/1600~1699/1658.Minimum-Operations-to-Reduce-X-to-Zero.md
similarity index 100%
rename from website/content/ChapterFour/1658.Minimum-Operations-to-Reduce-X-to-Zero.md
rename to website/content/ChapterFour/1600~1699/1658.Minimum-Operations-to-Reduce-X-to-Zero.md
diff --git a/website/content/ChapterFour/1659.Maximize-Grid-Happiness.md b/website/content/ChapterFour/1600~1699/1659.Maximize-Grid-Happiness.md
similarity index 100%
rename from website/content/ChapterFour/1659.Maximize-Grid-Happiness.md
rename to website/content/ChapterFour/1600~1699/1659.Maximize-Grid-Happiness.md
diff --git a/website/content/ChapterFour/1662.Check-If-Two-String-Arrays-are-Equivalent.md b/website/content/ChapterFour/1600~1699/1662.Check-If-Two-String-Arrays-are-Equivalent.md
similarity index 100%
rename from website/content/ChapterFour/1662.Check-If-Two-String-Arrays-are-Equivalent.md
rename to website/content/ChapterFour/1600~1699/1662.Check-If-Two-String-Arrays-are-Equivalent.md
diff --git a/website/content/ChapterFour/1663.Smallest-String-With-A-Given-Numeric-Value.md b/website/content/ChapterFour/1600~1699/1663.Smallest-String-With-A-Given-Numeric-Value.md
similarity index 100%
rename from website/content/ChapterFour/1663.Smallest-String-With-A-Given-Numeric-Value.md
rename to website/content/ChapterFour/1600~1699/1663.Smallest-String-With-A-Given-Numeric-Value.md
diff --git a/website/content/ChapterFour/1664.Ways-to-Make-a-Fair-Array.md b/website/content/ChapterFour/1600~1699/1664.Ways-to-Make-a-Fair-Array.md
similarity index 100%
rename from website/content/ChapterFour/1664.Ways-to-Make-a-Fair-Array.md
rename to website/content/ChapterFour/1600~1699/1664.Ways-to-Make-a-Fair-Array.md
diff --git a/website/content/ChapterFour/1665.Minimum-Initial-Energy-to-Finish-Tasks.md b/website/content/ChapterFour/1600~1699/1665.Minimum-Initial-Energy-to-Finish-Tasks.md
similarity index 100%
rename from website/content/ChapterFour/1665.Minimum-Initial-Energy-to-Finish-Tasks.md
rename to website/content/ChapterFour/1600~1699/1665.Minimum-Initial-Energy-to-Finish-Tasks.md
diff --git a/website/content/ChapterFour/1668.Maximum-Repeating-Substring.md b/website/content/ChapterFour/1600~1699/1668.Maximum-Repeating-Substring.md
similarity index 100%
rename from website/content/ChapterFour/1668.Maximum-Repeating-Substring.md
rename to website/content/ChapterFour/1600~1699/1668.Maximum-Repeating-Substring.md
diff --git a/website/content/ChapterFour/1669.Merge-In-Between-Linked-Lists.md b/website/content/ChapterFour/1600~1699/1669.Merge-In-Between-Linked-Lists.md
similarity index 100%
rename from website/content/ChapterFour/1669.Merge-In-Between-Linked-Lists.md
rename to website/content/ChapterFour/1600~1699/1669.Merge-In-Between-Linked-Lists.md
diff --git a/website/content/ChapterFour/1670.Design-Front-Middle-Back-Queue.md b/website/content/ChapterFour/1600~1699/1670.Design-Front-Middle-Back-Queue.md
similarity index 100%
rename from website/content/ChapterFour/1670.Design-Front-Middle-Back-Queue.md
rename to website/content/ChapterFour/1600~1699/1670.Design-Front-Middle-Back-Queue.md
diff --git a/website/content/ChapterFour/1672.Richest-Customer-Wealth.md b/website/content/ChapterFour/1600~1699/1672.Richest-Customer-Wealth.md
similarity index 100%
rename from website/content/ChapterFour/1672.Richest-Customer-Wealth.md
rename to website/content/ChapterFour/1600~1699/1672.Richest-Customer-Wealth.md
diff --git a/website/content/ChapterFour/1673.Find-the-Most-Competitive-Subsequence.md b/website/content/ChapterFour/1600~1699/1673.Find-the-Most-Competitive-Subsequence.md
similarity index 100%
rename from website/content/ChapterFour/1673.Find-the-Most-Competitive-Subsequence.md
rename to website/content/ChapterFour/1600~1699/1673.Find-the-Most-Competitive-Subsequence.md
diff --git a/website/content/ChapterFour/1674.Minimum-Moves-to-Make-Array-Complementary.md b/website/content/ChapterFour/1600~1699/1674.Minimum-Moves-to-Make-Array-Complementary.md
similarity index 100%
rename from website/content/ChapterFour/1674.Minimum-Moves-to-Make-Array-Complementary.md
rename to website/content/ChapterFour/1600~1699/1674.Minimum-Moves-to-Make-Array-Complementary.md
diff --git a/website/content/ChapterFour/1678.Goal-Parser-Interpretation.md b/website/content/ChapterFour/1600~1699/1678.Goal-Parser-Interpretation.md
similarity index 100%
rename from website/content/ChapterFour/1678.Goal-Parser-Interpretation.md
rename to website/content/ChapterFour/1600~1699/1678.Goal-Parser-Interpretation.md
diff --git a/website/content/ChapterFour/1679.Max-Number-of-K-Sum-Pairs.md b/website/content/ChapterFour/1600~1699/1679.Max-Number-of-K-Sum-Pairs.md
similarity index 100%
rename from website/content/ChapterFour/1679.Max-Number-of-K-Sum-Pairs.md
rename to website/content/ChapterFour/1600~1699/1679.Max-Number-of-K-Sum-Pairs.md
diff --git a/website/content/ChapterFour/1680.Concatenation-of-Consecutive-Binary-Numbers.md b/website/content/ChapterFour/1600~1699/1680.Concatenation-of-Consecutive-Binary-Numbers.md
similarity index 100%
rename from website/content/ChapterFour/1680.Concatenation-of-Consecutive-Binary-Numbers.md
rename to website/content/ChapterFour/1600~1699/1680.Concatenation-of-Consecutive-Binary-Numbers.md
diff --git a/website/content/ChapterFour/1681.Minimum-Incompatibility.md b/website/content/ChapterFour/1600~1699/1681.Minimum-Incompatibility.md
similarity index 100%
rename from website/content/ChapterFour/1681.Minimum-Incompatibility.md
rename to website/content/ChapterFour/1600~1699/1681.Minimum-Incompatibility.md
diff --git a/website/content/ChapterFour/1684.Count-the-Number-of-Consistent-Strings.md b/website/content/ChapterFour/1600~1699/1684.Count-the-Number-of-Consistent-Strings.md
similarity index 100%
rename from website/content/ChapterFour/1684.Count-the-Number-of-Consistent-Strings.md
rename to website/content/ChapterFour/1600~1699/1684.Count-the-Number-of-Consistent-Strings.md
diff --git a/website/content/ChapterFour/1685.Sum-of-Absolute-Differences-in-a-Sorted-Array.md b/website/content/ChapterFour/1600~1699/1685.Sum-of-Absolute-Differences-in-a-Sorted-Array.md
similarity index 100%
rename from website/content/ChapterFour/1685.Sum-of-Absolute-Differences-in-a-Sorted-Array.md
rename to website/content/ChapterFour/1600~1699/1685.Sum-of-Absolute-Differences-in-a-Sorted-Array.md
diff --git a/website/content/ChapterFour/1688.Count-of-Matches-in-Tournament.md b/website/content/ChapterFour/1600~1699/1688.Count-of-Matches-in-Tournament.md
similarity index 100%
rename from website/content/ChapterFour/1688.Count-of-Matches-in-Tournament.md
rename to website/content/ChapterFour/1600~1699/1688.Count-of-Matches-in-Tournament.md
diff --git a/website/content/ChapterFour/1689.Partitioning-Into-Minimum-Number-Of-Deci-Binary-Numbers.md b/website/content/ChapterFour/1600~1699/1689.Partitioning-Into-Minimum-Number-Of-Deci-Binary-Numbers.md
similarity index 100%
rename from website/content/ChapterFour/1689.Partitioning-Into-Minimum-Number-Of-Deci-Binary-Numbers.md
rename to website/content/ChapterFour/1600~1699/1689.Partitioning-Into-Minimum-Number-Of-Deci-Binary-Numbers.md
diff --git a/website/content/ChapterFour/1690.Stone-Game-VII.md b/website/content/ChapterFour/1600~1699/1690.Stone-Game-VII.md
similarity index 100%
rename from website/content/ChapterFour/1690.Stone-Game-VII.md
rename to website/content/ChapterFour/1600~1699/1690.Stone-Game-VII.md
diff --git a/website/content/ChapterFour/1694.Reformat-Phone-Number.md b/website/content/ChapterFour/1600~1699/1694.Reformat-Phone-Number.md
similarity index 100%
rename from website/content/ChapterFour/1694.Reformat-Phone-Number.md
rename to website/content/ChapterFour/1600~1699/1694.Reformat-Phone-Number.md
diff --git a/website/content/ChapterFour/1695.Maximum-Erasure-Value.md b/website/content/ChapterFour/1600~1699/1695.Maximum-Erasure-Value.md
similarity index 100%
rename from website/content/ChapterFour/1695.Maximum-Erasure-Value.md
rename to website/content/ChapterFour/1600~1699/1695.Maximum-Erasure-Value.md
diff --git a/website/content/ChapterFour/1696.Jump-Game-VI.md b/website/content/ChapterFour/1600~1699/1696.Jump-Game-VI.md
similarity index 100%
rename from website/content/ChapterFour/1696.Jump-Game-VI.md
rename to website/content/ChapterFour/1600~1699/1696.Jump-Game-VI.md
diff --git a/website/content/ChapterFour/1600~1699/_index.md b/website/content/ChapterFour/1600~1699/_index.md
new file mode 100644
index 000000000..d2021683f
--- /dev/null
+++ b/website/content/ChapterFour/1600~1699/_index.md
@@ -0,0 +1,5 @@
+---
+bookCollapseSection: true
+weight: 20
+---
+
diff --git a/website/content/ChapterFour/1700~1799/_index.md b/website/content/ChapterFour/1700~1799/_index.md
new file mode 100644
index 000000000..d2021683f
--- /dev/null
+++ b/website/content/ChapterFour/1700~1799/_index.md
@@ -0,0 +1,5 @@
+---
+bookCollapseSection: true
+weight: 20
+---
+
diff --git a/website/content/ChapterFour/_index.md b/website/content/ChapterFour/_index.md
index bcc5b320f..7024aa8e5 100644
--- a/website/content/ChapterFour/_index.md
+++ b/website/content/ChapterFour/_index.md
@@ -1,9 +1,10 @@
 ---
-title: 第四章
+title: 第四章 LeetCode 题解
 type: docs
+weight: 4
 ---
 
-# 第四章 Leetcode 题解
+# 第四章 LeetCode 题解
 
 <p align='center'>
 <img src='https://img.halfrost.com/Leetcode/GOPHERCON_.png'>
diff --git a/website/content/ChapterOne/Algorithm.md b/website/content/ChapterOne/Algorithm.md
index bdf969326..c43698381 100644
--- a/website/content/ChapterOne/Algorithm.md
+++ b/website/content/ChapterOne/Algorithm.md
@@ -1,6 +1,7 @@
 ---
-title: 算法知识
+title: 1.2 算法知识
 type: docs
+weight: 2
 ---
 
 # 算法知识
diff --git a/website/content/ChapterOne/Data_Structure.md b/website/content/ChapterOne/Data_Structure.md
index 1d9ca35f3..04cf67ac9 100644
--- a/website/content/ChapterOne/Data_Structure.md
+++ b/website/content/ChapterOne/Data_Structure.md
@@ -1,6 +1,7 @@
 ---
-title: 数据结构知识
+title: 1.1 数据结构知识
 type: docs
+weight: 1
 ---
 
 # 数据结构知识
diff --git a/website/content/ChapterOne/_index.md b/website/content/ChapterOne/_index.md
index 0eba551e6..48ff3ac10 100644
--- a/website/content/ChapterOne/_index.md
+++ b/website/content/ChapterOne/_index.md
@@ -1,6 +1,7 @@
 ---
-title: 第一章
+title: 第一章 序章
 type: docs
+weight: 1
 ---
 
 # 第一章 序章
diff --git a/website/content/ChapterThree/_index.md b/website/content/ChapterThree/_index.md
index 02f248457..b078b1d66 100644
--- a/website/content/ChapterThree/_index.md
+++ b/website/content/ChapterThree/_index.md
@@ -1,6 +1,7 @@
 ---
-title: 第三章
+title: 第三章 一些模板
 type: docs
+weight: 3
 ---
 
 # 第三章 一些模板
diff --git a/website/content/ChapterTwo/_index.md b/website/content/ChapterTwo/_index.md
index 4699e8ca3..af78a6c3e 100644
--- a/website/content/ChapterTwo/_index.md
+++ b/website/content/ChapterTwo/_index.md
@@ -1,6 +1,7 @@
 ---
-title: 第二章
+title: 第二章 算法专题
 type: docs
+weight: 2
 ---
 
 # 第二章 算法专题
diff --git a/website/content/docs/example/_index.md b/website/content/docs/example/_index.md
deleted file mode 100644
index 4835b7ca0..000000000
--- a/website/content/docs/example/_index.md
+++ /dev/null
@@ -1,71 +0,0 @@
----
-weight: 1
-bookFlatSection: true
-title: "Example Site"
----
-
-# Introduction
-
-## Ferre hinnitibus erat accipitrem dixi Troiae tollens
-
-Lorem markdownum, a quoque nutu est *quodcumque mandasset* veluti. Passim
-inportuna totidemque nympha fert; repetens pendent, poenarum guttura sed vacet
-non, mortali undas. Omnis pharetramque gramen portentificisque membris servatum
-novabis fallit de nubibus atque silvas mihi. **Dixit repetitaque Quid**; verrit
-longa; sententia [mandat](http://pastor-ad.io/questussilvas) quascumque nescio
-solebat [litore](http://lacrimas-ab.net/); noctes. *Hostem haerentem* circuit
-[plenaque tamen](http://www.sine.io/in).
-
-- Pedum ne indigenae finire invergens carpebat
-- Velit posses summoque
-- De fumos illa foret
-
-## Est simul fameque tauri qua ad
-
-Locum nullus nisi vomentes. Ab Persea sermone vela, miratur aratro; eandem
-Argolicas gener.
-
-## Me sol
-
-Nec dis certa fuit socer, Nonacria **dies** manet tacitaque sibi? Sucis est
-iactata Castrumque iudex, et iactato quoque terraeque es tandem et maternos
-vittis. Lumina litus bene poenamque animos callem ne tuas in leones illam dea
-cadunt genus, et pleno nunc in quod. Anumque crescentesque sanguinis
-[progenies](http://www.late.net/alimentavirides) nuribus rustica tinguet. Pater
-omnes liquido creditis noctem.
-
-    if (mirrored(icmp_dvd_pim, 3, smbMirroredHard) != lion(clickImportQueue,
-            viralItunesBalancing, bankruptcy_file_pptp)) {
-        file += ip_cybercrime_suffix;
-    }
-    if (runtimeSmartRom == netMarketingWord) {
-        virusBalancingWin *= scriptPromptBespoke + raster(post_drive,
-                windowsSli);
-        cd = address_hertz_trojan;
-        soap_ccd.pcbServerGigahertz(asp_hardware_isa, offlinePeopleware, nui);
-    } else {
-        megabyte.api = modem_flowchart - web + syntaxHalftoneAddress;
-    }
-    if (3 < mebibyteNetworkAnimated) {
-        pharming_regular_error *= jsp_ribbon + algorithm * recycleMediaKindle(
-                dvrSyntax, cdma);
-        adf_sla *= hoverCropDrive;
-        templateNtfs = -1 - vertical;
-    } else {
-        expressionCompressionVariable.bootMulti = white_eup_javascript(
-                table_suffix);
-        guidPpiPram.tracerouteLinux += rtfTerabyteQuicktime(1,
-                managementRosetta(webcamActivex), 740874);
-    }
-    var virusTweetSsl = nullGigo;
-
-## Trepident sitimque
-
-Sentiet et ferali errorem fessam, coercet superbus, Ascaniumque in pennis
-mediis; dolor? Vidit imi **Aeacon** perfida propositos adde, tua Somni Fluctibus
-errante lustrat non.
-
-Tamen inde, vos videt e flammis Scythica parantem rupisque pectora umbras. Haec
-ficta canistris repercusso simul ego aris Dixit! Esse Fama trepidare hunc
-crescendo vigor ululasse vertice *exspatiantur* celer tepidique petita aversata
-oculis iussa est me ferro.
diff --git a/website/content/docs/example/collapsed/3rd-level/4th-level.md b/website/content/docs/example/collapsed/3rd-level/4th-level.md
deleted file mode 100644
index aa451f19e..000000000
--- a/website/content/docs/example/collapsed/3rd-level/4th-level.md
+++ /dev/null
@@ -1,12 +0,0 @@
-# 4th Level of Menu
-
-## Caesorum illa tu sentit micat vestes papyriferi
-
-Inde aderam facti; Theseus vis de tauri illa peream. Oculos **uberaque** non
-regisque vobis cursuque, opus venit quam vulnera. Et maiora necemque, lege modo;
-gestanda nitidi, vero? Dum ne pectoraque testantur.
-
-Venasque repulsa Samos qui, exspectatum eram animosque hinc, [aut
-manes](http://www.creveratnon.net/apricaaetheriis), Assyrii. Cupiens auctoribus
-pariter rubet, profana magni super nocens. Vos ius sibilat inpar turba visae
-iusto! Sedes ante dum superest **extrema**.
diff --git a/website/content/docs/example/collapsed/3rd-level/_index.md b/website/content/docs/example/collapsed/3rd-level/_index.md
deleted file mode 100644
index cc0100f3c..000000000
--- a/website/content/docs/example/collapsed/3rd-level/_index.md
+++ /dev/null
@@ -1,26 +0,0 @@
-# 3rd Level of Menu
-
-Nefas discordemque domino montes numen tum humili nexilibusque exit, Iove. Quae
-miror esse, scelerisque Melaneus viribus. Miseri laurus. Hoc est proposita me
-ante aliquid, aura inponere candidioribus quidque accendit bella, sumpta.
-Intravit quam erat figentem hunc, motus de fontes parvo tempestate.
-
-    iscsi_virus = pitch(json_in_on(eupViral),
-            northbridge_services_troubleshooting, personal(
-            firmware_rw.trash_rw_crm.device(interactive_gopher_personal,
-            software, -1), megabit, ergonomicsSoftware(cmyk_usb_panel,
-            mips_whitelist_duplex, cpa)));
-    if (5) {
-        managementNetwork += dma - boolean;
-        kilohertz_token = 2;
-        honeypot_affiliate_ergonomics = fiber;
-    }
-    mouseNorthbridge = byte(nybble_xmp_modem.horse_subnet(
-            analogThroughputService * graphicPoint, drop(daw_bit, dnsIntranet),
-            gateway_ospf), repository.domain_key.mouse(serverData(fileNetwork,
-            trim_duplex_file), cellTapeDirect, token_tooltip_mashup(
-            ripcordingMashup)));
-    module_it = honeypot_driver(client_cold_dvr(593902, ripping_frequency) +
-            coreLog.joystick(componentUdpLink), windows_expansion_touchscreen);
-    bashGigabit.external.reality(2, server_hardware_codec.flops.ebookSampling(
-            ciscNavigationBacklink, table + cleanDriver), indexProtocolIsp);
diff --git a/website/content/docs/example/collapsed/_index.md b/website/content/docs/example/collapsed/_index.md
deleted file mode 100644
index 806bc2efa..000000000
--- a/website/content/docs/example/collapsed/_index.md
+++ /dev/null
@@ -1,23 +0,0 @@
----
-bookCollapseSection: true
-weight: 20
----
-
-# Collapsed Level of Menu
-
-## Cognita laeva illo fracta
-
-Lorem markdownum pavent auras, surgit nunc cingentibus libet **Laomedonque que**
-est. Pastor [An](http://est.org/ire.aspx) arbor filia foedat, ne [fugit
-aliter](http://www.indiciumturbam.org/moramquid.php), per. Helicona illas et
-callida neptem est *Oresitrophos* caput, dentibus est venit. Tenet reddite
-[famuli](http://www.antro-et.net/) praesentem fortibus, quaeque vis foret si
-frondes *gelidos* gravidae circumtulit [inpulit armenta
-nativum](http://incurvasustulit.io/illi-virtute.html).
-
-1. Te at cruciabere vides rubentis manebo
-2. Maturuit in praetemptat ruborem ignara postquam habitasse
-3. Subitarum supplevit quoque fontesque venabula spretis modo
-4. Montis tot est mali quasque gravis
-5. Quinquennem domus arsit ipse
-6. Pellem turis pugnabant locavit
diff --git a/website/content/docs/example/hidden.md b/website/content/docs/example/hidden.md
deleted file mode 100644
index df7cb9ebb..000000000
--- a/website/content/docs/example/hidden.md
+++ /dev/null
@@ -1,52 +0,0 @@
----
-bookHidden: true
----
-
-# This page is hidden in menu
-
-# Quondam non pater est dignior ille Eurotas
-
-## Latent te facies
-
-Lorem markdownum arma ignoscas vocavit quoque ille texit mandata mentis ultimus,
-frementes, qui in vel. Hippotades Peleus [pennas
-conscia](http://gratia.net/tot-qua.php) cuiquam Caeneus quas.
-
-- Pater demittere evincitque reddunt
-- Maxime adhuc pressit huc Danaas quid freta
-- Soror ego
-- Luctus linguam saxa ultroque prior Tatiumque inquit
-- Saepe liquitur subita superata dederat Anius sudor
-
-## Cum honorum Latona
-
-O fallor [in sustinui
-iussorum](http://www.spectataharundine.org/aquas-relinquit.html) equidem.
-Nymphae operi oris alii fronde parens dumque, in auro ait mox ingenti proxima
-iamdudum maius?
-
-    reality(burnDocking(apache_nanometer),
-            pad.property_data_programming.sectorBrowserPpga(dataMask, 37,
-            recycleRup));
-    intellectualVaporwareUser += -5 * 4;
-    traceroute_key_upnp /= lag_optical(android.smb(thyristorTftp));
-    surge_host_golden = mca_compact_device(dual_dpi_opengl, 33,
-            commerce_add_ppc);
-    if (lun_ipv) {
-        verticalExtranet(1, thumbnail_ttl, 3);
-        bar_graphics_jpeg(chipset - sector_xmp_beta);
-    }
-
-## Fronde cetera dextrae sequens pennis voce muneris
-
-Acta cretus diem restet utque; move integer, oscula non inspirat, noctisque
-scelus! Nantemque in suas vobis quamvis, et labori!
-
-    var runtimeDiskCompiler = home - array_ad_software;
-    if (internic > disk) {
-        emoticonLockCron += 37 + bps - 4;
-        wan_ansi_honeypot.cardGigaflops = artificialStorageCgi;
-        simplex -= downloadAccess;
-    }
-    var volumeHardeningAndroid = pixel + tftp + onProcessorUnmount;
-    sector(memory(firewire + interlaced, wired));
\ No newline at end of file
diff --git a/website/content/docs/example/table-of-contents/_index.md b/website/content/docs/example/table-of-contents/_index.md
deleted file mode 100644
index c7ee0d872..000000000
--- a/website/content/docs/example/table-of-contents/_index.md
+++ /dev/null
@@ -1,85 +0,0 @@
----
-weight: 10
----
-
-# Ubi loqui
-
-## Mentem genus facietque salire tempus bracchia
-
-Lorem markdownum partu paterno Achillem. Habent amne generosi aderant ad pellem
-nec erat sustinet merces columque haec et, dixit minus nutrit accipiam subibis
-subdidit. Temeraria servatum agros qui sed fulva facta. Primum ultima, dedit,
-suo quisque linguae medentes fixo: tum petis.
-
-## Rapit vocant si hunc siste adspice
-
-Ora precari Patraeque Neptunia, dixit Danae [Cithaeron
-armaque](http://mersis-an.org/litoristum) maxima in **nati Coniugis** templis
-fluidove. Effugit usus nec ingreditur agmen *ac manus* conlato. Nullis vagis
-nequiquam vultibus aliquos altera *suum venis* teneas fretum. Armos [remotis
-hoc](http://tutum.io/me) sine ferrea iuncta quam!
-
-## Locus fuit caecis
-
-Nefas discordemque domino montes numen tum humili nexilibusque exit, Iove. Quae
-miror esse, scelerisque Melaneus viribus. Miseri laurus. Hoc est proposita me
-ante aliquid, aura inponere candidioribus quidque accendit bella, sumpta.
-Intravit quam erat figentem hunc, motus de fontes parvo tempestate.
-
-    iscsi_virus = pitch(json_in_on(eupViral),
-            northbridge_services_troubleshooting, personal(
-            firmware_rw.trash_rw_crm.device(interactive_gopher_personal,
-            software, -1), megabit, ergonomicsSoftware(cmyk_usb_panel,
-            mips_whitelist_duplex, cpa)));
-    if (5) {
-        managementNetwork += dma - boolean;
-        kilohertz_token = 2;
-        honeypot_affiliate_ergonomics = fiber;
-    }
-    mouseNorthbridge = byte(nybble_xmp_modem.horse_subnet(
-            analogThroughputService * graphicPoint, drop(daw_bit, dnsIntranet),
-            gateway_ospf), repository.domain_key.mouse(serverData(fileNetwork,
-            trim_duplex_file), cellTapeDirect, token_tooltip_mashup(
-            ripcordingMashup)));
-    module_it = honeypot_driver(client_cold_dvr(593902, ripping_frequency) +
-            coreLog.joystick(componentUdpLink), windows_expansion_touchscreen);
-    bashGigabit.external.reality(2, server_hardware_codec.flops.ebookSampling(
-            ciscNavigationBacklink, table + cleanDriver), indexProtocolIsp);
-
-## Placabilis coactis nega ingemuit ignoscat nimia non
-
-Frontis turba. Oculi gravis est Delphice; *inque praedaque* sanguine manu non.
-
-    if (ad_api) {
-        zif += usb.tiffAvatarRate(subnet, digital_rt) + exploitDrive;
-        gigaflops(2 - bluetooth, edi_asp_memory.gopher(queryCursor, laptop),
-                panel_point_firmware);
-        spyware_bash.statePopApplet = express_netbios_digital(
-                insertion_troubleshooting.brouter(recordFolderUs), 65);
-    }
-    recursionCoreRay = -5;
-    if (hub == non) {
-        portBoxVirus = soundWeb(recursive_card(rwTechnologyLeopard),
-                font_radcab, guidCmsScalable + reciprocalMatrixPim);
-        left.bug = screenshot;
-    } else {
-        tooltipOpacity = raw_process_permalink(webcamFontUser, -1);
-        executable_router += tape;
-    }
-    if (tft) {
-        bandwidthWeb *= social_page;
-    } else {
-        regular += 611883;
-        thumbnail /= system_lag_keyboard;
-    }
-
-## Caesorum illa tu sentit micat vestes papyriferi
-
-Inde aderam facti; Theseus vis de tauri illa peream. Oculos **uberaque** non
-regisque vobis cursuque, opus venit quam vulnera. Et maiora necemque, lege modo;
-gestanda nitidi, vero? Dum ne pectoraque testantur.
-
-Venasque repulsa Samos qui, exspectatum eram animosque hinc, [aut
-manes](http://www.creveratnon.net/apricaaetheriis), Assyrii. Cupiens auctoribus
-pariter rubet, profana magni super nocens. Vos ius sibilat inpar turba visae
-iusto! Sedes ante dum superest **extrema**.
diff --git a/website/content/docs/example/table-of-contents/with-toc.md b/website/content/docs/example/table-of-contents/with-toc.md
deleted file mode 100644
index 5345c668a..000000000
--- a/website/content/docs/example/table-of-contents/with-toc.md
+++ /dev/null
@@ -1,64 +0,0 @@
----
-title: With ToC
-weight: 1
----
-# Caput vino delphine in tamen vias
-
-## Cognita laeva illo fracta
-
-Lorem markdownum pavent auras, surgit nunc cingentibus libet **Laomedonque que**
-est. Pastor [An](http://est.org/ire.aspx) arbor filia foedat, ne [fugit
-aliter](http://www.indiciumturbam.org/moramquid.php), per. Helicona illas et
-callida neptem est *Oresitrophos* caput, dentibus est venit. Tenet reddite
-[famuli](http://www.antro-et.net/) praesentem fortibus, quaeque vis foret si
-frondes *gelidos* gravidae circumtulit [inpulit armenta
-nativum](http://incurvasustulit.io/illi-virtute.html).
-
-1. Te at cruciabere vides rubentis manebo
-2. Maturuit in praetemptat ruborem ignara postquam habitasse
-3. Subitarum supplevit quoque fontesque venabula spretis modo
-4. Montis tot est mali quasque gravis
-5. Quinquennem domus arsit ipse
-6. Pellem turis pugnabant locavit
-
-## Natus quaerere
-
-Pectora et sine mulcere, coniuge dum tincta incurvae. Quis iam; est dextra
-Peneosque, metuis a verba, primo. Illa sed colloque suis: magno: gramen, aera
-excutiunt concipit.
-
-> Phrygiae petendo suisque extimuit, super, pars quod audet! Turba negarem.
-> Fuerat attonitus; et dextra retinet sidera ulnas undas instimulat vacuae
-> generis? *Agnus* dabat et ignotis dextera, sic tibi pacis **feriente at mora**
-> euhoeque *comites hostem* vestras Phineus. Vultuque sanguine dominoque [metuit
-> risi](http://iuvat.org/eundem.php) fama vergit summaque meus clarissimus
-> artesque tinguebat successor nominis cervice caelicolae.
-
-## Limitibus misere sit
-
-Aurea non fata repertis praerupit feruntur simul, meae hosti lentaque *citius
-levibus*, cum sede dixit, Phaethon texta. *Albentibus summos* multifidasque
-iungitur loquendi an pectore, mihi ursaque omnia adfata, aeno parvumque in animi
-perlucentes. Epytus agis ait vixque clamat ornum adversam spondet, quid sceptra
-ipsum **est**. Reseret nec; saeva suo passu debentia linguam terga et aures et
-cervix [de](http://www.amnem.io/pervenit.aspx) ubera. Coercet gelidumque manus,
-doluit volvitur induta?
-
-## Enim sua
-
-Iuvenilior filia inlustre templa quidem herbis permittat trahens huic. In
-cruribus proceres sole crescitque *fata*, quos quos; merui maris se non tamen
-in, mea.
-
-## Germana aves pignus tecta
-
-Mortalia rudibusque caelum cognosceret tantum aquis redito felicior texit, nec,
-aris parvo acre. Me parum contulerant multi tenentem, gratissime suis; vultum tu
-occupat deficeret corpora, sonum. E Actaea inplevit Phinea concepit nomenque
-potest sanguine captam nulla et, in duxisses campis non; mercede. Dicere cur
-Leucothoen obitum?
-
-Postibus mittam est *nubibus principium pluma*, exsecratur facta et. Iunge
-Mnemonidas pallamque pars; vere restitit alis flumina quae **quoque**, est
-ignara infestus Pyrrha. Di ducis terris maculatum At sede praemia manes
-nullaque!
diff --git a/website/content/docs/example/table-of-contents/without-toc.md b/website/content/docs/example/table-of-contents/without-toc.md
deleted file mode 100644
index 9b1631883..000000000
--- a/website/content/docs/example/table-of-contents/without-toc.md
+++ /dev/null
@@ -1,59 +0,0 @@
----
-title: Without ToC
-weight: 2
-bookToc: false
----
-
-# At me ipso nepotibus nunc celebratior genus
-
-## Tanto oblite
-
-Lorem markdownum pectora novis patenti igne sua opus aurae feras materiaque
-illic demersit imago et aristas questaque posset. Vomit quoque suo inhaesuro
-clara. Esse cumque, per referri triste. Ut exponit solisque communis in tendens
-vincetis agisque iamque huic bene ante vetat omina Thebae rates. Aeacus servat
-admonitu concidit, ad resimas vultus et rugas vultu **dignamque** Siphnon.
-
-Quam iugulum regia simulacra, plus meruit humo pecorumque haesit, ab discedunt
-dixit: ritu pharetramque. Exul Laurenti orantem modo, per densum missisque labor
-manibus non colla unum, obiectat. Tu pervia collo, fessus quae Cretenque Myconon
-crate! Tegumenque quae invisi sudore per vocari quaque plus ventis fluidos. Nodo
-perque, fugisse pectora sorores.
-
-## Summe promissa supple vadit lenius
-
-Quibus largis latebris aethera versato est, ait sentiat faciemque. Aequata alis
-nec Caeneus exululat inclite corpus est, ire **tibi** ostendens et tibi. Rigent
-et vires dique possent lumina; **eadem** dixit poma funeribus paret et felix
-reddebant ventis utile lignum.
-
-1. Remansit notam Stygia feroxque
-2. Et dabit materna
-3. Vipereas Phrygiaeque umbram sollicito cruore conlucere suus
-4. Quarum Elis corniger
-5. Nec ieiunia dixit
-
-Vertitur mos ortu ramosam contudit dumque; placabat ac lumen. Coniunx Amoris
-spatium poenamque cavernis Thebae Pleiadasque ponunt, rapiare cum quae parum
-nimium rima.
-
-## Quidem resupinus inducto solebat una facinus quae
-
-Credulitas iniqua praepetibus paruit prospexit, voce poena, sub rupit sinuatur,
-quin suum ventorumque arcadiae priori. Soporiferam erat formamque, fecit,
-invergens, nymphae mutat fessas ait finge.
-
-1. Baculum mandataque ne addere capiti violentior
-2. Altera duas quam hoc ille tenues inquit
-3. Sicula sidereus latrantis domoque ratae polluit comites
-4. Possit oro clausura namque se nunc iuvenisque
-5. Faciem posuit
-6. Quodque cum ponunt novercae nata vestrae aratra
-
-Ite extrema Phrygiis, patre dentibus, tonso perculit, enim blanda, manibus fide
-quos caput armis, posse! Nocendo fas Alcyonae lacertis structa ferarum manus
-fulmen dubius, saxa caelum effuge extremis fixum tumor adfecit **bella**,
-potentes? Dum nec insidiosa tempora tegit
-[spirarunt](http://mihiferre.net/iuvenes-peto.html). Per lupi pars foliis,
-porreximus humum negant sunt subposuere Sidone steterant auro. Memoraverit sine:
-ferrum idem Orion caelum heres gerebat fixis?
diff --git a/website/content/docs/shortcodes/_index.md b/website/content/docs/shortcodes/_index.md
deleted file mode 100644
index 9bb0430cb..000000000
--- a/website/content/docs/shortcodes/_index.md
+++ /dev/null
@@ -1,3 +0,0 @@
----
-bookFlatSection: true
----
diff --git a/website/content/docs/shortcodes/buttons.md b/website/content/docs/shortcodes/buttons.md
deleted file mode 100644
index c2ef1e755..000000000
--- a/website/content/docs/shortcodes/buttons.md
+++ /dev/null
@@ -1,13 +0,0 @@
-# Buttons
-
-Buttons are styled links that can lead to local page or external link.
-
-## Example
-
-```tpl
-{{</* button relref="/" [class="..."] */>}}Get Home{{</* /button */>}}
-{{</* button href="https://github.com/alex-shpak/hugo-book" */>}}Contribute{{</* /button */>}}
-```
-
-{{< button relref="/" >}}Get Home{{< /button >}}
-{{< button href="https://github.com/alex-shpak/hugo-book" >}}Contribute{{< /button >}}
diff --git a/website/content/docs/shortcodes/columns.md b/website/content/docs/shortcodes/columns.md
deleted file mode 100644
index 4df396a67..000000000
--- a/website/content/docs/shortcodes/columns.md
+++ /dev/null
@@ -1,45 +0,0 @@
-# Columns
-
-Columns help organize shorter pieces of content horizontally for readability.
-
-
-```html
-{{</* columns */>}} <!-- begin columns block -->
-# Left Content
-Lorem markdownum insigne...
-
-<---> <!-- magic sparator, between columns -->
-
-# Mid Content
-Lorem markdownum insigne...
-
-<---> <!-- magic sparator, between columns -->
-
-# Right Content
-Lorem markdownum insigne...
-{{</* /columns */>}}
-```
-
-## Example
-
-{{< columns >}}
-## Left Content
-Lorem markdownum insigne. Olympo signis Delphis! Retexi Nereius nova develat
-stringit, frustra Saturnius uteroque inter! Oculis non ritibus Telethusa
-protulit, sed sed aere valvis inhaesuro Pallas animam: qui _quid_, ignes.
-Miseratus fonte Ditis conubia.
-
-<--->
-
-## Mid Content
-Lorem markdownum insigne. Olympo signis Delphis! Retexi Nereius nova develat
-stringit, frustra Saturnius uteroque inter!
-
-<--->
-
-## Right Content
-Lorem markdownum insigne. Olympo signis Delphis! Retexi Nereius nova develat
-stringit, frustra Saturnius uteroque inter! Oculis non ritibus Telethusa
-protulit, sed sed aere valvis inhaesuro Pallas animam: qui _quid_, ignes.
-Miseratus fonte Ditis conubia.
-{{< /columns >}}
diff --git a/website/content/docs/shortcodes/details.md b/website/content/docs/shortcodes/details.md
deleted file mode 100644
index 248bafd97..000000000
--- a/website/content/docs/shortcodes/details.md
+++ /dev/null
@@ -1,22 +0,0 @@
-# Details
-
-Details shortcode is a helper for `details` html5 element. It is going to replace `expand` shortcode.
-
-## Example
-```tpl
-{{</* details "Title" [open] */>}}
-## Markdown content
-Lorem markdownum insigne...
-{{</* /details */>}}
-```
-```tpl
-{{</* details title="Title" open=true */>}}
-## Markdown content
-Lorem markdownum insigne...
-{{</* /details */>}}
-```
-
-{{< details "Title" open >}}
-## Markdown content
-Lorem markdownum insigne...
-{{< /details >}}
diff --git a/website/content/docs/shortcodes/expand.md b/website/content/docs/shortcodes/expand.md
deleted file mode 100644
index c62520f3f..000000000
--- a/website/content/docs/shortcodes/expand.md
+++ /dev/null
@@ -1,35 +0,0 @@
-# Expand
-
-Expand shortcode can help to decrease clutter on screen by hiding part of text. Expand content by clicking on it.
-
-## Example
-### Default
-
-```tpl
-{{</* expand */>}}
-## Markdown content
-Lorem markdownum insigne...
-{{</* /expand */>}}
-```
-
-{{< expand >}}
-## Markdown content
-Lorem markdownum insigne...
-{{< /expand >}}
-
-### With Custom Label
-
-```tpl
-{{</* expand "Custom Label" "..." */>}}
-## Markdown content
-Lorem markdownum insigne...
-{{</* /expand */>}}
-```
-
-{{< expand "Custom Label" "..." >}}
-## Markdown content
-Lorem markdownum insigne. Olympo signis Delphis! Retexi Nereius nova develat
-stringit, frustra Saturnius uteroque inter! Oculis non ritibus Telethusa
-protulit, sed sed aere valvis inhaesuro Pallas animam: qui _quid_, ignes.
-Miseratus fonte Ditis conubia.
-{{< /expand >}}
diff --git a/website/content/docs/shortcodes/hints.md b/website/content/docs/shortcodes/hints.md
deleted file mode 100644
index 3477113de..000000000
--- a/website/content/docs/shortcodes/hints.md
+++ /dev/null
@@ -1,32 +0,0 @@
-# Hints
-
-Hint shortcode can be used as hint/alerts/notification block.  
-There are 3 colors to choose: `info`, `warning` and `danger`.
-
-```tpl
-{{</* hint [info|warning|danger] */>}}
-**Markdown content**  
-Lorem markdownum insigne. Olympo signis Delphis! Retexi Nereius nova develat
-stringit, frustra Saturnius uteroque inter! Oculis non ritibus Telethusa
-{{</* /hint */>}}
-```
-
-## Example
-
-{{< hint info >}}
-**Markdown content**  
-Lorem markdownum insigne. Olympo signis Delphis! Retexi Nereius nova develat
-stringit, frustra Saturnius uteroque inter! Oculis non ritibus Telethusa
-{{< /hint >}}
-
-{{< hint warning >}}
-**Markdown content**  
-Lorem markdownum insigne. Olympo signis Delphis! Retexi Nereius nova develat
-stringit, frustra Saturnius uteroque inter! Oculis non ritibus Telethusa
-{{< /hint >}}
-
-{{< hint danger >}}
-**Markdown content**  
-Lorem markdownum insigne. Olympo signis Delphis! Retexi Nereius nova develat
-stringit, frustra Saturnius uteroque inter! Oculis non ritibus Telethusa
-{{< /hint >}}
diff --git a/website/content/docs/shortcodes/katex.md b/website/content/docs/shortcodes/katex.md
deleted file mode 100644
index 4beeaa004..000000000
--- a/website/content/docs/shortcodes/katex.md
+++ /dev/null
@@ -1,28 +0,0 @@
-# KaTeX
-
-KaTeX shortcode let you render math typesetting in markdown document. See [KaTeX](https://katex.org/)
-
-## Example
-{{< columns >}}
-
-```latex
-{{</* katex [display] [class="text-center"]  */>}}
-f(x) = \int_{-\infty}^\infty\hat f(\xi)\,e^{2 \pi i \xi x}\,d\xi
-{{</* /katex */>}}
-```
-
-<--->
-
-{{< katex display >}}
-f(x) = \int_{-\infty}^\infty\hat f(\xi)\,e^{2 \pi i \xi x}\,d\xi
-{{< /katex >}}
-
-{{< /columns >}}
-
-## Display Mode Example
-
-Here is some inline example: {{< katex >}}\pi(x){{< /katex >}}, rendered in the same line. And below is `display` example, having `display: block`
-{{< katex display >}}
-f(x) = \int_{-\infty}^\infty\hat f(\xi)\,e^{2 \pi i \xi x}\,d\xi
-{{< /katex >}}
-Text continues here.
diff --git a/website/content/docs/shortcodes/mermaid.md b/website/content/docs/shortcodes/mermaid.md
deleted file mode 100644
index 3a617bcc0..000000000
--- a/website/content/docs/shortcodes/mermaid.md
+++ /dev/null
@@ -1,38 +0,0 @@
-# Mermaid Chart
-
-[Mermaid](https://mermaidjs.github.io/) is library for generating svg charts and diagrams from text.
-
-## Example
-
-{{< columns >}}
-```tpl
-{{</* mermaid [class="text-center"]*/>}}
-sequenceDiagram
-    Alice->>Bob: Hello Bob, how are you?
-    alt is sick
-        Bob->>Alice: Not so good :(
-    else is well
-        Bob->>Alice: Feeling fresh like a daisy
-    end
-    opt Extra response
-        Bob->>Alice: Thanks for asking
-    end
-{{</* /mermaid */>}}
-```
-
-<--->
-
-{{< mermaid >}}
-sequenceDiagram
-    Alice->>Bob: Hello Bob, how are you?
-    alt is sick
-        Bob->>Alice: Not so good :(
-    else is well
-        Bob->>Alice: Feeling fresh like a daisy
-    end
-    opt Extra response
-        Bob->>Alice: Thanks for asking
-    end
-{{< /mermaid >}}
-
-{{< /columns >}}
diff --git a/website/content/docs/shortcodes/section/_index.md b/website/content/docs/shortcodes/section/_index.md
deleted file mode 100644
index bd5db38b3..000000000
--- a/website/content/docs/shortcodes/section/_index.md
+++ /dev/null
@@ -1,15 +0,0 @@
----
-bookCollapseSection: true
----
-
-# Section
-
-Section renders pages in section as definition list, using title and description.
-
-## Example
-
-```tpl
-{{</* section */>}}
-```
-
-{{<section>}}
diff --git a/website/content/docs/shortcodes/section/page1.md b/website/content/docs/shortcodes/section/page1.md
deleted file mode 100644
index 960800143..000000000
--- a/website/content/docs/shortcodes/section/page1.md
+++ /dev/null
@@ -1 +0,0 @@
-# Page 1
diff --git a/website/content/docs/shortcodes/section/page2.md b/website/content/docs/shortcodes/section/page2.md
deleted file mode 100644
index f310be332..000000000
--- a/website/content/docs/shortcodes/section/page2.md
+++ /dev/null
@@ -1 +0,0 @@
-# Page 2
diff --git a/website/content/docs/shortcodes/tabs.md b/website/content/docs/shortcodes/tabs.md
deleted file mode 100644
index 096892c67..000000000
--- a/website/content/docs/shortcodes/tabs.md
+++ /dev/null
@@ -1,50 +0,0 @@
-# Tabs
-
-Tabs let you organize content by context, for example installation instructions for each supported platform.
-
-```tpl
-{{</* tabs "uniqueid" */>}}
-{{</* tab "MacOS" */>}} # MacOS Content {{</* /tab */>}}
-{{</* tab "Linux" */>}} # Linux Content {{</* /tab */>}}
-{{</* tab "Windows" */>}} # Windows Content {{</* /tab */>}}
-{{</* /tabs */>}}
-```
-
-## Example
-
-{{< tabs "uniqueid" >}}
-{{< tab "MacOS" >}}
-# MacOS
-
-This is tab **MacOS** content.
-
-Lorem markdownum insigne. Olympo signis Delphis! Retexi Nereius nova develat
-stringit, frustra Saturnius uteroque inter! Oculis non ritibus Telethusa
-protulit, sed sed aere valvis inhaesuro Pallas animam: qui _quid_, ignes.
-Miseratus fonte Ditis conubia.
-{{< /tab >}}
-
-{{< tab "Linux" >}}
-
-# Linux
-
-This is tab **Linux** content.
-
-Lorem markdownum insigne. Olympo signis Delphis! Retexi Nereius nova develat
-stringit, frustra Saturnius uteroque inter! Oculis non ritibus Telethusa
-protulit, sed sed aere valvis inhaesuro Pallas animam: qui _quid_, ignes.
-Miseratus fonte Ditis conubia.
-{{< /tab >}}
-
-{{< tab "Windows" >}}
-
-# Windows
-
-This is tab **Windows** content.
-
-Lorem markdownum insigne. Olympo signis Delphis! Retexi Nereius nova develat
-stringit, frustra Saturnius uteroque inter! Oculis non ritibus Telethusa
-protulit, sed sed aere valvis inhaesuro Pallas animam: qui _quid_, ignes.
-Miseratus fonte Ditis conubia.
-{{< /tab >}}
-{{< /tabs >}}
diff --git a/website/content/menu/index.md b/website/content/menu/_index.md
similarity index 100%
rename from website/content/menu/index.md
rename to website/content/menu/_index.md