diff --git a/01-rstudio-intro.html b/01-rstudio-intro.html
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@@ -947,7 +947,7 @@ <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1"> チャレンジ８の解答 1 </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>The following can be used as R variables:</p>
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   <h4 class="accordion-header" id="headingSolution2"> チャレンジ８の解答 </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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   <h4 class="accordion-header" id="headingSolution3"> チャレンジ３の解答 </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>One way of answering this question in R is to use the
 <code>&gt;</code> to set up the following:</p>
@@ -1307,7 +1307,7 @@ <h3 class="callout-title">チャレンジ４</h3>
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   <h4 class="accordion-header" id="headingSolution4"> チャレンジ８の解答 </h4>
 </button>
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 <p>We can use the <code>rm</code> command to accomplish this task</p>
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@@ -1337,7 +1337,7 @@ <h3 class="callout-title">チャレンジ５</h3>
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   <h4 class="accordion-header" id="headingSolution5"> チャレンジ８の解答 </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
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 <p>We can use the <code>install.packages()</code> command to install the
 required packages.</p>
@@ -1440,7 +1440,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/01-rstudio-intro.html",
   "dateCreated": "2015-04-18",
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+  "datePublished": "2025-01-14"
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diff --git a/02-project-intro.html b/02-project-intro.html
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@@ -812,7 +812,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/02-project-intro.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2025-01-07"
+  "datePublished": "2025-01-14"
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diff --git a/03-seeking-help.html b/03-seeking-help.html
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--- a/03-seeking-help.html
+++ b/03-seeking-help.html
@@ -870,7 +870,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/03-seeking-help.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2025-01-07"
+  "datePublished": "2025-01-14"
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diff --git a/04-data-structures-part1.html b/04-data-structures-part1.html
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   議論１
   </h4>
 </button>
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 <p>By keeping everything in a column the same, we allow ourselves to
 make simple assumptions about our data; if you can interpret one entry
@@ -1082,7 +1082,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Tip 1.1
   </h4>
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 <p>Show the content of any variable by typing its name.</p>
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   Tip 1.2
   </h4>
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 <p>In the chapter “Data types” we saw two functions that can show data
 types. One printed just a single word, the data type name. The other
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 <p>Scroll up to the section about the <a href="#the-type-hierarchy">type
 hierarchy</a> to review the available data types</p>
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 <ul><li>Weight is expressed on a continuous scale (real numbers). The R data
 type for this is “double” (also known as “numeric”).</li>
@@ -1204,7 +1204,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Tip 1.4
   </h4>
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 <p>Revisit the hierarchy of data types when two different data types are
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 <p>The functions to convert data types start with <code>as.</code>. You
 can look for the function further up in the manuscript or use the
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 <p>You get the names of an object by wrapping the object name inside
 <code>names(...)</code>. Similarly, you get the data type of the names
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 <pre><code><span><span class="va">letter_no</span> <span class="op">&lt;-</span> <span class="fl">1</span><span class="op">:</span><span class="fl">26</span>   <span class="co"># or seq(1,26)</span></span>
 <span><span class="fu">names</span><span class="op">(</span><span class="va">letter_no</span><span class="op">)</span> <span class="op">&lt;-</span> <span class="va">LETTERS</span></span>
@@ -1890,7 +1890,7 @@ <h4 class="accordion-header" id="headingSolution11">
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 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb138">
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   </h4>
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 <p>What do you think will be the result of
 <code>length(matrix_example)</code>?</p>
@@ -2194,7 +2194,7 @@ <h4 class="accordion-header" id="headingSolution13">
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 <div class="accordion-body">
 <p>もう一つ行列を作ってみましょう、今回は、1:50の数を含むもので、
 ５行、10列を持つ行列にしましょう。 この <code>matrix</code>
@@ -2235,7 +2235,7 @@ <h4 class="accordion-header" id="headingSolution14">
   チャレンジ３の解答
   </h4>
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 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb173">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
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   </h4>
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 <p>Consider the R output of the matrix below:</p>
 <div class="codewrapper">
@@ -2386,7 +2386,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/04-data-structures-part1.html",
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diff --git a/05-data-structures-part2.html b/05-data-structures-part2.html
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   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
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 <p>To check the last few lines it’s relatively simple as R already has a
 function for this:</p>
@@ -1033,7 +1033,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
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 <p>The <code>source</code> function can be used to use a script within a
 script. Assume you would like to load the same type of file over and
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 <p>The object <code>gapminder</code> is a data frame with columns</p>
 <ul><li>
@@ -1177,7 +1177,7 @@ <h3 class="callout-title">まとめ</h3>
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diff --git a/06-data-subsetting.html b/06-data-subsetting.html
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   </h4>
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   チャレンジ８の解答
   </h4>
 </button>
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   </h4>
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 <ul><li>The <strong>wrong</strong> way to do this problem is
 <code>countries==seAsia</code>. This gives a warning
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 <p>D</p>
 </div>
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   チャレンジ８の解答
   </h4>
 </button>
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 <div class="codewrapper sourceCode" id="cb113">
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   チャレンジ８の解答
   </h4>
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 <div class="codewrapper sourceCode" id="cb120">
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   チャレンジ８の解答
   </h4>
 </button>
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 <div class="accordion-body">
 <p>Fix each of the following common data frame subsetting errors:</p>
 <ol style="list-style-type: decimal"><li>Extract observations collected for the year 1957</li>
@@ -1853,7 +1853,7 @@ <h4 class="accordion-header" id="headingSolution8">
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 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li><p><code>gapminder</code>
 は、データフレームなので、２つの次元の部分集合を作る必要があります。
@@ -1947,7 +1947,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/06-data-subsetting.html",
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   "dateModified": "2024-11-19",
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+  "datePublished": "2025-01-14"
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   </script><script>
diff --git a/07-control-flow.html b/07-control-flow.html
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   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
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 <p>We will first see a solution to Challenge 1 which does not use the
 <code>any()</code> function. We first obtain a logical vector describing
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   </h4>
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 <div class="accordion-body">
 <p>We can check whether the two vectors are identical using the
 <code>all()</code> function:</p>
@@ -980,7 +980,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p><strong>Step 1</strong>: We want to make sure we can extract all the
 unique values of the continent vector</p>
@@ -1059,7 +1059,7 @@ <h4 class="accordion-header" id="headingSolution4">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>We modify our solution to Challenge 3 by now adding two thresholds,
 <code>lowerThreshold</code> and <code>upperThreshold</code> and
@@ -1094,7 +1094,7 @@ <h4 class="accordion-header" id="headingSolution5">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <p>We will use the <code>grep()</code> command that was introduced in
 the <a href="https://swcarpentry.github.io/shell-novice/07-find.html" class="external-link">Unix
@@ -1224,7 +1224,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/07-control-flow.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2025-01-07"
+  "datePublished": "2025-01-14"
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   </script><script>
diff --git a/08-plot-ggplot2.html b/08-plot-ggplot2.html
index d04935558..d27adf7fd 100644
--- a/08-plot-ggplot2.html
+++ b/08-plot-ggplot2.html
@@ -1080,7 +1080,7 @@ <h3 class="callout-title">まとめ</h3>
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   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2025-01-07"
+  "datePublished": "2025-01-14"
 }
 
   </script><script>
diff --git a/09-vectorization.html b/09-vectorization.html
index ea62281e6..9fa01e5be 100644
--- a/09-vectorization.html
+++ b/09-vectorization.html
@@ -1022,7 +1022,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/09-vectorization.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2025-01-07"
+  "datePublished": "2025-01-14"
 }
 
   </script><script>
diff --git a/10-functions.html b/10-functions.html
index 8292f1d44..5c32b9217 100644
--- a/10-functions.html
+++ b/10-functions.html
@@ -1153,7 +1153,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/10-functions.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2025-01-07"
+  "datePublished": "2025-01-14"
 }
 
   </script><script>
diff --git a/11-writing-data.html b/11-writing-data.html
index a35a81626..c14408dc4 100644
--- a/11-writing-data.html
+++ b/11-writing-data.html
@@ -480,7 +480,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ８の解答 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb3">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -602,7 +602,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb11">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -686,7 +686,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/11-writing-data.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2025-01-07"
+  "datePublished": "2025-01-14"
 }
 
   </script><script>
diff --git a/12-dplyr.html b/12-dplyr.html
index a72eef121..7874c0c2f 100644
--- a/12-dplyr.html
+++ b/12-dplyr.html
@@ -649,7 +649,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
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 <div class="accordion-body">
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@@ -779,7 +779,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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@@ -1136,7 +1136,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to Advanced Challenge
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
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@@ -1246,7 +1246,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/12-dplyr.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2025-01-07"
+  "datePublished": "2025-01-14"
 }
 
   </script><script>
diff --git a/13-tidyr.html b/13-tidyr.html
index 07190deae..cde01414d 100644
--- a/13-tidyr.html
+++ b/13-tidyr.html
@@ -1174,7 +1174,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/13-tidyr.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2025-01-07"
+  "datePublished": "2025-01-14"
 }
 
   </script><script>
diff --git a/14-knitr-markdown.html b/14-knitr-markdown.html
index 0558a981d..659d01cf4 100644
--- a/14-knitr-markdown.html
+++ b/14-knitr-markdown.html
@@ -924,7 +924,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/14-knitr-markdown.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2025-01-07"
+  "datePublished": "2025-01-14"
 }
 
   </script><script>
diff --git a/15-wrap-up.html b/15-wrap-up.html
index adda755ed..5a319d506 100644
--- a/15-wrap-up.html
+++ b/15-wrap-up.html
@@ -590,7 +590,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/15-wrap-up.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2025-01-07"
+  "datePublished": "2025-01-14"
 }
 
   </script><script>
diff --git a/404.html b/404.html
index 9e2b6c725..1334185e5 100644
--- a/404.html
+++ b/404.html
@@ -464,8 +464,8 @@ <h1>ページが見つかりません</h1>
   "url": "https://swcarpentry.github.io/r-novice-gapminder/404.html",
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/404.html",
   "dateCreated": "2015-04-18",
-  "dateModified": "2025-01-07",
-  "datePublished": "2025-01-07"
+  "dateModified": "2025-01-14",
+  "datePublished": "2025-01-14"
 }
 
   </script><script>
diff --git a/CODE_OF_CONDUCT.html b/CODE_OF_CONDUCT.html
index 2a6bf0de1..a77443798 100644
--- a/CODE_OF_CONDUCT.html
+++ b/CODE_OF_CONDUCT.html
@@ -464,7 +464,7 @@ <h1>Contributor Code of Conduct</h1>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/CODE_OF_CONDUCT.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2025-01-07"
+  "datePublished": "2025-01-14"
 }
 
   </script><script>
diff --git a/LICENSE.html b/LICENSE.html
index dd920149c..909c637cd 100644
--- a/LICENSE.html
+++ b/LICENSE.html
@@ -510,7 +510,7 @@ <h1>Licenses</h1>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/LICENSE.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2025-01-07"
+  "datePublished": "2025-01-14"
 }
 
   </script><script>
diff --git a/aio.html b/aio.html
index 5c2e14249..60ce4f752 100644
--- a/aio.html
+++ b/aio.html
@@ -1041,7 +1041,7 @@ <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1"> チャレンジ８の解答 1 </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>The following can be used as R variables:</p>
 <div class="codewrapper sourceCode" id="cb44">
@@ -1318,7 +1318,7 @@ <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i
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   <h4 class="accordion-header" id="headingSolution2"> チャレンジ８の解答 </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb65">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1371,7 +1371,7 @@ <h3 class="callout-title">チャレンジ３</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
   <h4 class="accordion-header" id="headingSolution3"> チャレンジ３の解答 </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>One way of answering this question in R is to use the
 <code>&gt;</code> to set up the following:</p>
@@ -1409,7 +1409,7 @@ <h3 class="callout-title">チャレンジ４</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
   <h4 class="accordion-header" id="headingSolution4"> チャレンジ８の解答 </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>We can use the <code>rm</code> command to accomplish this task</p>
 <div class="codewrapper sourceCode" id="cb71">
@@ -1439,7 +1439,7 @@ <h3 class="callout-title">チャレンジ５</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution5" aria-expanded="false" aria-controls="collapseSolution5">
   <h4 class="accordion-header" id="headingSolution5"> チャレンジ８の解答 </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <p>We can use the <code>install.packages()</code> command to install the
 required packages.</p>
@@ -2771,7 +2771,7 @@ <h4 class="accordion-header" id="headingSolution1">
   議論１
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>By keeping everything in a column the same, we allow ourselves to
 make simple assumptions about our data; if you can interpret one entry
@@ -2996,7 +2996,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Tip 1.1
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>Show the content of any variable by typing its name.</p>
 <div class="section level3">
@@ -3030,7 +3030,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Tip 1.2
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>In the chapter “Data types” we saw two functions that can show data
 types. One printed just a single word, the data type name. The other
@@ -3074,7 +3074,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Tip 1.3
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>Scroll up to the section about the <a href="#the-type-hierarchy">type
 hierarchy</a> to review the available data types</p>
@@ -3089,7 +3089,7 @@ <h4 class="accordion-header" id="headingSolution5">
   チャレンジ３の解答
   </h4>
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-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
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 <div class="accordion-body">
 <ul>
 <li>Weight is expressed on a continuous scale (real numbers). The R data
@@ -3124,7 +3124,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Tip 1.4
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
 <div class="accordion-body">
 <p>Revisit the hierarchy of data types when two different data types are
 combined.</p>
@@ -3165,7 +3165,7 @@ <h4 class="accordion-header" id="headingSolution7">
   Tip 1.5
   </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
 <div class="accordion-body">
 <p>The functions to convert data types start with <code>as.</code>. You
 can look for the function further up in the manuscript or use the
@@ -3357,7 +3357,7 @@ <h4 class="accordion-header" id="headingSolution8">
   チャレンジ３の解答
   </h4>
 </button>
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 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb92">
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@@ -3588,7 +3588,7 @@ <h4 class="accordion-header" id="headingSolution9">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution9" class="accordion-collapse collapse" aria-labelledby="headingSolution9" data-bs-parent="#accordionSolution9">
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 <div class="accordion-body">
 <p>You get the names of an object by wrapping the object name inside
 <code>names(...)</code>. Similarly, you get the data type of the names
@@ -3634,7 +3634,7 @@ <h4 class="accordion-header" id="headingSolution10">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution10" class="accordion-collapse collapse" aria-labelledby="headingSolution10" data-bs-parent="#accordionSolution10">
+<div id="collapseSolution10" class="accordion-collapse collapse" data-bs-parent="#accordionSolution10" aria-labelledby="headingSolution10">
 <div class="accordion-body">
 <pre><code><span><span class="va">letter_no</span> <span class="op">&lt;-</span> <span class="fl">1</span><span class="op">:</span><span class="fl">26</span>   <span class="co"># or seq(1,26)</span></span>
 <span><span class="fu">names</span><span class="op">(</span><span class="va">letter_no</span><span class="op">)</span> <span class="op">&lt;-</span> <span class="va">LETTERS</span></span>
@@ -3825,7 +3825,7 @@ <h4 class="accordion-header" id="headingSolution11">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution11" class="accordion-collapse collapse" aria-labelledby="headingSolution11" data-bs-parent="#accordionSolution11">
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 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb138">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -4085,7 +4085,7 @@ <h4 class="accordion-header" id="headingSolution12">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution12" class="accordion-collapse collapse" aria-labelledby="headingSolution12" data-bs-parent="#accordionSolution12">
+<div id="collapseSolution12" class="accordion-collapse collapse" data-bs-parent="#accordionSolution12" aria-labelledby="headingSolution12">
 <div class="accordion-body">
 <p>What do you think will be the result of
 <code>length(matrix_example)</code>?</p>
@@ -4130,7 +4130,7 @@ <h4 class="accordion-header" id="headingSolution13">
   チャレンジ３の解答
   </h4>
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-<div id="collapseSolution13" class="accordion-collapse collapse" aria-labelledby="headingSolution13" data-bs-parent="#accordionSolution13">
+<div id="collapseSolution13" class="accordion-collapse collapse" data-bs-parent="#accordionSolution13" aria-labelledby="headingSolution13">
 <div class="accordion-body">
 <p>もう一つ行列を作ってみましょう、今回は、1:50の数を含むもので、
 ５行、10列を持つ行列にしましょう。 この <code>matrix</code>
@@ -4173,7 +4173,7 @@ <h4 class="accordion-header" id="headingSolution14">
   チャレンジ３の解答
   </h4>
 </button>
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 <div class="codewrapper sourceCode" id="cb173">
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@@ -4226,7 +4226,7 @@ <h4 class="accordion-header" id="headingSolution15">
   チャレンジ３の解答
   </h4>
 </button>
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 <p>Consider the R output of the matrix below:</p>
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 <p>To check the last few lines it’s relatively simple as R already has a
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 <p>We can check whether the two vectors are identical using the
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 <p><strong>Step 1</strong>: We want to make sure we can extract all the
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 <p>We modify our solution to Challenge 3 by now adding two thresholds,
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 <p>One way of answering this question in R is to use the
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 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
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 <div class="accordion-body">
 <p>In the chapter “Data types” we saw two functions that can show data
 types. One printed just a single word, the data type name. The other
@@ -1158,7 +1158,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Tip 1.3
   </h4>
 </button>
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 <p>Scroll up to the section about the <a href="#the-type-hierarchy">type
 hierarchy</a> to review the available data types</p>
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 <div class="accordion-body">
 <ul><li>Weight is expressed on a continuous scale (real numbers). The R data
 type for this is “double” (also known as “numeric”).</li>
@@ -1206,7 +1206,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Tip 1.4
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
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 <p>Revisit the hierarchy of data types when two different data types are
 combined.</p>
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 <div class="accordion-body">
 <p>The functions to convert data types start with <code>as.</code>. You
 can look for the function further up in the manuscript or use the
@@ -1437,7 +1437,7 @@ <h4 class="accordion-header" id="headingSolution8">
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   </h4>
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 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb92">
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@@ -1661,7 +1661,7 @@ <h4 class="accordion-header" id="headingSolution9">
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   </h4>
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-<div id="collapseSolution9" class="accordion-collapse collapse" aria-labelledby="headingSolution9" data-bs-parent="#accordionSolution9">
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 <div class="accordion-body">
 <p>You get the names of an object by wrapping the object name inside
 <code>names(...)</code>. Similarly, you get the data type of the names
@@ -1705,7 +1705,7 @@ <h4 class="accordion-header" id="headingSolution10">
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   </h4>
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 <div class="accordion-body">
 <pre><code><span><span class="va">letter_no</span> <span class="op">&lt;-</span> <span class="fl">1</span><span class="op">:</span><span class="fl">26</span>   <span class="co"># or seq(1,26)</span></span>
 <span><span class="fu">names</span><span class="op">(</span><span class="va">letter_no</span><span class="op">)</span> <span class="op">&lt;-</span> <span class="va">LETTERS</span></span>
@@ -1892,7 +1892,7 @@ <h4 class="accordion-header" id="headingSolution11">
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   </h4>
 </button>
-<div id="collapseSolution11" class="accordion-collapse collapse" aria-labelledby="headingSolution11" data-bs-parent="#accordionSolution11">
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 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb138">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -2151,7 +2151,7 @@ <h4 class="accordion-header" id="headingSolution12">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution12" class="accordion-collapse collapse" aria-labelledby="headingSolution12" data-bs-parent="#accordionSolution12">
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 <div class="accordion-body">
 <p>What do you think will be the result of
 <code>length(matrix_example)</code>?</p>
@@ -2196,7 +2196,7 @@ <h4 class="accordion-header" id="headingSolution13">
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 <div class="accordion-body">
 <p>もう一つ行列を作ってみましょう、今回は、1:50の数を含むもので、
 ５行、10列を持つ行列にしましょう。 この <code>matrix</code>
@@ -2237,7 +2237,7 @@ <h4 class="accordion-header" id="headingSolution14">
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 <div class="codewrapper sourceCode" id="cb173">
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@@ -2288,7 +2288,7 @@ <h4 class="accordion-header" id="headingSolution15">
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   </h4>
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-<div id="collapseSolution15" class="accordion-collapse collapse" aria-labelledby="headingSolution15" data-bs-parent="#accordionSolution15">
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 <div class="accordion-body">
 <p>Consider the R output of the matrix below:</p>
 <div class="codewrapper">
@@ -2388,7 +2388,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/04-data-structures-part1.html",
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   "dateModified": "2024-11-19",
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diff --git a/instructor/05-data-structures-part2.html b/instructor/05-data-structures-part2.html
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   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
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 <div class="accordion-body">
 <p>To check the last few lines it’s relatively simple as R already has a
 function for this:</p>
@@ -1035,7 +1035,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
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 <div class="accordion-body">
 <p>The <code>source</code> function can be used to use a script within a
 script. Assume you would like to load the same type of file over and
@@ -1083,7 +1083,7 @@ <h4 class="accordion-header" id="headingSolution4">
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 <div class="accordion-body">
 <p>The object <code>gapminder</code> is a data frame with columns</p>
 <ul><li>
@@ -1179,7 +1179,7 @@ <h3 class="callout-title">まとめ</h3>
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   </h4>
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   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
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 <div class="accordion-body">
 <ul><li>The <strong>wrong</strong> way to do this problem is
 <code>countries==seAsia</code>. This gives a warning
@@ -1420,7 +1420,7 @@ <h4 class="accordion-header" id="headingSolution4">
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   </h4>
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-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
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 <p>D</p>
 </div>
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   </h4>
 </button>
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 <div class="accordion-body">
 <p>Fix each of the following common data frame subsetting errors:</p>
 <ol style="list-style-type: decimal"><li>Extract observations collected for the year 1957</li>
@@ -1855,7 +1855,7 @@ <h4 class="accordion-header" id="headingSolution8">
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-<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
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 <ol style="list-style-type: decimal"><li><p><code>gapminder</code>
 は、データフレームなので、２つの次元の部分集合を作る必要があります。
@@ -1949,7 +1949,7 @@ <h3 class="callout-title">まとめ</h3>
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   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
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 <p>We will first see a solution to Challenge 1 which does not use the
 <code>any()</code> function. We first obtain a logical vector describing
@@ -897,7 +897,7 @@ <h4 class="accordion-header" id="headingSolution2">
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   </h4>
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-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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 <p>We can check whether the two vectors are identical using the
 <code>all()</code> function:</p>
@@ -982,7 +982,7 @@ <h4 class="accordion-header" id="headingSolution3">
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   </h4>
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 <p><strong>Step 1</strong>: We want to make sure we can extract all the
 unique values of the continent vector</p>
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-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
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 <p>We modify our solution to Challenge 3 by now adding two thresholds,
 <code>lowerThreshold</code> and <code>upperThreshold</code> and
@@ -1096,7 +1096,7 @@ <h4 class="accordion-header" id="headingSolution5">
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 <p>We will use the <code>grep()</code> command that was introduced in
 the <a href="https://swcarpentry.github.io/shell-novice/07-find.html" class="external-link">Unix
@@ -1226,7 +1226,7 @@ <h3 class="callout-title">まとめ</h3>
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diff --git a/instructor/08-plot-ggplot2.html b/instructor/08-plot-ggplot2.html
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 </button>
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 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb23">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
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   Solution to Advanced Challenge
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb52">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1248,7 +1248,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/12-dplyr.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2025-01-07"
+  "datePublished": "2025-01-14"
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   </script><script>
diff --git a/instructor/13-tidyr.html b/instructor/13-tidyr.html
index e320f887b..df9e5a14b 100644
--- a/instructor/13-tidyr.html
+++ b/instructor/13-tidyr.html
@@ -1176,7 +1176,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/13-tidyr.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2025-01-07"
+  "datePublished": "2025-01-14"
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   </script><script>
diff --git a/instructor/14-knitr-markdown.html b/instructor/14-knitr-markdown.html
index 766432e08..9e6d9ea40 100644
--- a/instructor/14-knitr-markdown.html
+++ b/instructor/14-knitr-markdown.html
@@ -926,7 +926,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/14-knitr-markdown.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2025-01-07"
+  "datePublished": "2025-01-14"
 }
 
   </script><script>
diff --git a/instructor/15-wrap-up.html b/instructor/15-wrap-up.html
index 472a4690f..3647cfaf4 100644
--- a/instructor/15-wrap-up.html
+++ b/instructor/15-wrap-up.html
@@ -592,7 +592,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/15-wrap-up.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2025-01-07"
+  "datePublished": "2025-01-14"
 }
 
   </script><script>
diff --git a/instructor/404.html b/instructor/404.html
index 8f54a6b59..a9cdda8f2 100644
--- a/instructor/404.html
+++ b/instructor/404.html
@@ -464,8 +464,8 @@ <h1>ページが見つかりません</h1>
   "url": "https://swcarpentry.github.io/r-novice-gapminder/instructor/404.html",
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/404.html",
   "dateCreated": "2015-04-18",
-  "dateModified": "2025-01-07",
-  "datePublished": "2025-01-07"
+  "dateModified": "2025-01-14",
+  "datePublished": "2025-01-14"
 }
 
   </script><script>
diff --git a/instructor/CODE_OF_CONDUCT.html b/instructor/CODE_OF_CONDUCT.html
index 9d5993517..a2a267eb2 100644
--- a/instructor/CODE_OF_CONDUCT.html
+++ b/instructor/CODE_OF_CONDUCT.html
@@ -466,7 +466,7 @@ <h1>Contributor Code of Conduct</h1>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/CODE_OF_CONDUCT.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2025-01-07"
+  "datePublished": "2025-01-14"
 }
 
   </script><script>
diff --git a/instructor/LICENSE.html b/instructor/LICENSE.html
index 94c475663..698fa07fc 100644
--- a/instructor/LICENSE.html
+++ b/instructor/LICENSE.html
@@ -512,7 +512,7 @@ <h1>Licenses</h1>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/LICENSE.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2025-01-07"
+  "datePublished": "2025-01-14"
 }
 
   </script><script>
diff --git a/instructor/aio.html b/instructor/aio.html
index 5c4d71325..03315b8fe 100644
--- a/instructor/aio.html
+++ b/instructor/aio.html
@@ -1044,7 +1044,7 @@ <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1"> チャレンジ８の解答 1 </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>The following can be used as R variables:</p>
 <div class="codewrapper sourceCode" id="cb44">
@@ -1321,7 +1321,7 @@ <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
   <h4 class="accordion-header" id="headingSolution2"> チャレンジ８の解答 </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb65">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1374,7 +1374,7 @@ <h3 class="callout-title">チャレンジ３</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
   <h4 class="accordion-header" id="headingSolution3"> チャレンジ３の解答 </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>One way of answering this question in R is to use the
 <code>&gt;</code> to set up the following:</p>
@@ -1412,7 +1412,7 @@ <h3 class="callout-title">チャレンジ４</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
   <h4 class="accordion-header" id="headingSolution4"> チャレンジ８の解答 </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>We can use the <code>rm</code> command to accomplish this task</p>
 <div class="codewrapper sourceCode" id="cb71">
@@ -1442,7 +1442,7 @@ <h3 class="callout-title">チャレンジ５</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution5" aria-expanded="false" aria-controls="collapseSolution5">
   <h4 class="accordion-header" id="headingSolution5"> チャレンジ８の解答 </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <p>We can use the <code>install.packages()</code> command to install the
 required packages.</p>
@@ -1471,7 +1471,7 @@ <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i
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   <h3 class="accordion-header" id="headingInstructor1">  <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="edit-2"></i></div> インストラクター用メモ </h3>
 </button>
-<div id="collapseInstructor1" class="accordion-collapse collapse" aria-labelledby="headingInstructor1" data-bs-parent="#accordionInstructor1">
+<div id="collapseInstructor1" class="accordion-collapse collapse" data-bs-parent="#accordionInstructor1" aria-labelledby="headingInstructor1">
 <div class="accordion-body">
 <p>When installing ggplot2, it may be required for some users to use the
 dependencies flag as a result of lazy loading affecting the install.
@@ -2798,7 +2798,7 @@ <h4 class="accordion-header" id="headingSolution1">
   議論１
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>By keeping everything in a column the same, we allow ourselves to
 make simple assumptions about our data; if you can interpret one entry
@@ -3023,7 +3023,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Tip 1.1
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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 <div class="accordion-body">
 <p>Show the content of any variable by typing its name.</p>
 <div class="section level3">
@@ -3057,7 +3057,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Tip 1.2
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>In the chapter “Data types” we saw two functions that can show data
 types. One printed just a single word, the data type name. The other
@@ -3101,7 +3101,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Tip 1.3
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
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 <div class="accordion-body">
 <p>Scroll up to the section about the <a href="#the-type-hierarchy">type
 hierarchy</a> to review the available data types</p>
@@ -3116,7 +3116,7 @@ <h4 class="accordion-header" id="headingSolution5">
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   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
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 <ul>
 <li>Weight is expressed on a continuous scale (real numbers). The R data
@@ -3151,7 +3151,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Tip 1.4
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
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 <p>Revisit the hierarchy of data types when two different data types are
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@@ -3192,7 +3192,7 @@ <h4 class="accordion-header" id="headingSolution7">
   Tip 1.5
   </h4>
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-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
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 <p>The functions to convert data types start with <code>as.</code>. You
 can look for the function further up in the manuscript or use the
@@ -3384,7 +3384,7 @@ <h4 class="accordion-header" id="headingSolution8">
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 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
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 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb92">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -3615,7 +3615,7 @@ <h4 class="accordion-header" id="headingSolution9">
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   </h4>
 </button>
-<div id="collapseSolution9" class="accordion-collapse collapse" aria-labelledby="headingSolution9" data-bs-parent="#accordionSolution9">
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 <div class="accordion-body">
 <p>You get the names of an object by wrapping the object name inside
 <code>names(...)</code>. Similarly, you get the data type of the names
@@ -3661,7 +3661,7 @@ <h4 class="accordion-header" id="headingSolution10">
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 </button>
-<div id="collapseSolution10" class="accordion-collapse collapse" aria-labelledby="headingSolution10" data-bs-parent="#accordionSolution10">
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 <div class="accordion-body">
 <pre><code><span><span class="va">letter_no</span> <span class="op">&lt;-</span> <span class="fl">1</span><span class="op">:</span><span class="fl">26</span>   <span class="co"># or seq(1,26)</span></span>
 <span><span class="fu">names</span><span class="op">(</span><span class="va">letter_no</span><span class="op">)</span> <span class="op">&lt;-</span> <span class="va">LETTERS</span></span>
@@ -3852,7 +3852,7 @@ <h4 class="accordion-header" id="headingSolution11">
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   </h4>
 </button>
-<div id="collapseSolution11" class="accordion-collapse collapse" aria-labelledby="headingSolution11" data-bs-parent="#accordionSolution11">
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 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb138">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -4112,7 +4112,7 @@ <h4 class="accordion-header" id="headingSolution12">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution12" class="accordion-collapse collapse" aria-labelledby="headingSolution12" data-bs-parent="#accordionSolution12">
+<div id="collapseSolution12" class="accordion-collapse collapse" data-bs-parent="#accordionSolution12" aria-labelledby="headingSolution12">
 <div class="accordion-body">
 <p>What do you think will be the result of
 <code>length(matrix_example)</code>?</p>
@@ -4157,7 +4157,7 @@ <h4 class="accordion-header" id="headingSolution13">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution13" class="accordion-collapse collapse" aria-labelledby="headingSolution13" data-bs-parent="#accordionSolution13">
+<div id="collapseSolution13" class="accordion-collapse collapse" data-bs-parent="#accordionSolution13" aria-labelledby="headingSolution13">
 <div class="accordion-body">
 <p>もう一つ行列を作ってみましょう、今回は、1:50の数を含むもので、
 ５行、10列を持つ行列にしましょう。 この <code>matrix</code>
@@ -4200,7 +4200,7 @@ <h4 class="accordion-header" id="headingSolution14">
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 </button>
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 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb173">
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@@ -4253,7 +4253,7 @@ <h4 class="accordion-header" id="headingSolution15">
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   </h4>
 </button>
-<div id="collapseSolution15" class="accordion-collapse collapse" aria-labelledby="headingSolution15" data-bs-parent="#accordionSolution15">
+<div id="collapseSolution15" class="accordion-collapse collapse" data-bs-parent="#accordionSolution15" aria-labelledby="headingSolution15">
 <div class="accordion-body">
 <p>Consider the R output of the matrix below:</p>
 <div class="codewrapper">
@@ -4601,7 +4601,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
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 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb28">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -4887,7 +4887,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>To check the last few lines it’s relatively simple as R already has a
 function for this:</p>
@@ -4947,7 +4947,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
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 <div class="accordion-body">
 <p>The <code>source</code> function can be used to use a script within a
 script. Assume you would like to load the same type of file over and
@@ -4995,7 +4995,7 @@ <h4 class="accordion-header" id="headingSolution4">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
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 <div class="accordion-body">
 <p>The object <code>gapminder</code> is a data frame with columns</p>
 <ul>
@@ -5369,7 +5369,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ８の解答 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
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 <div class="codewrapper sourceCode" id="cb34">
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@@ -5549,7 +5549,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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 <div class="codewrapper sourceCode" id="cb49">
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@@ -5796,7 +5796,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
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 <div class="accordion-body">
 <ul>
 <li>The <strong>wrong</strong> way to do this problem is
@@ -6076,7 +6076,7 @@ <h4 class="accordion-header" id="headingSolution4">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
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 <div class="accordion-body">
 <p>D</p>
 </div>
@@ -6220,7 +6220,7 @@ <h4 class="accordion-header" id="headingSolution5">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
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 <div class="accordion-body">
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 <ol style="list-style-type: decimal">
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 <li><p><code>gapminder</code>
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 <code>all()</code> function:</p>
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