diff --git a/grammars/progsys/Checksum.bnf b/grammars/progsys/Checksum.bnf
index d7ea0896..860ed85e 100644
--- a/grammars/progsys/Checksum.bnf
+++ b/grammars/progsys/Checksum.bnf
@@ -9,7 +9,7 @@
 <assign> ::= <bool_var>' = '<bool>|<int_assign>|<string_var>' = '<string>
 <number> ::= <number><num>|<num>
 <num> ::= '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
-<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='|'is'|'is not'
+<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='
 <string_const_part> ::= <string_const_part><string_literal>|<string_literal>
 <bool_var> ::= 'b0'|'b1'|'b2'
 <bool> ::= <bool_var>|<bool_const>|'not '<bool>|'( '<bool>' '<bool_op>' '<bool>' )'|<int>' '<comp_op>' '<int>|<string>' in '<string>|<string>' not in '<string>|<string>' == '<string>|<string>' != '<string>|<string>'.startswith('<string>')'|<string>'.endswith('<string>')'
diff --git a/grammars/progsys/Collatz Numbers.bnf b/grammars/progsys/Collatz Numbers.bnf
index 8ac9f53e..a8bd4407 100644
--- a/grammars/progsys/Collatz Numbers.bnf	
+++ b/grammars/progsys/Collatz Numbers.bnf	
@@ -9,7 +9,7 @@
 <assign> ::= <bool_var>' = '<bool>|<int_assign>|<float_assign>
 <number> ::= <number><num>|<num>
 <num> ::= '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
-<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='|'is'|'is not'
+<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='
 <bool_var> ::= 'b0'|'b1'|'b2'
 <bool> ::= <bool_var>|<bool_const>|'not '<bool>|'( '<bool>' '<bool_op>' '<bool>' )'|<int>' '<comp_op>' '<int>|<float>' '<comp_op>' '<float>|<int>' '<comp_op>' '<float>|<float>' '<comp_op>' '<int>
 <bool_op> ::= 'and'|'or'
diff --git a/grammars/progsys/Compare String Lengths.bnf b/grammars/progsys/Compare String Lengths.bnf
index 6663d44e..67a3ab1e 100644
--- a/grammars/progsys/Compare String Lengths.bnf	
+++ b/grammars/progsys/Compare String Lengths.bnf	
@@ -9,7 +9,7 @@
 <assign> ::= <bool_var>' = '<bool>|<int_assign>|<string_var>' = '<string>
 <number> ::= <number><num>|<num>
 <num> ::= '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
-<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='|'is'|'is not'
+<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='
 <string_const_part> ::= <string_const_part><string_literal>|<string_literal>
 <bool_var> ::= 'b0'|'b1'|'b2'|'res0'
 <bool> ::= <bool_var>|<bool_const>|'not '<bool>|'( '<bool>' '<bool_op>' '<bool>' )'|<int>' '<comp_op>' '<int>|<string>' in '<string>|<string>' not in '<string>|<string>' == '<string>|<string>' != '<string>|<string>'.startswith('<string>')'|<string>'.endswith('<string>')'
diff --git a/grammars/progsys/Count Odds.bnf b/grammars/progsys/Count Odds.bnf
index 511472e2..8ca7aa46 100644
--- a/grammars/progsys/Count Odds.bnf	
+++ b/grammars/progsys/Count Odds.bnf	
@@ -12,7 +12,7 @@
 <for> ::= 'loopBreak% = 0\nfor forCounter% in '<list_int>':{:\n'<code>'\nif loopBreak% > loopBreakConst or stop.value:{:\nbreak\n:}loopBreak% += 1\n:}'|'loopBreak% = 0\nfor '<int_var>' in '<list_int>':{:\n'<code>'\nif loopBreak% > loopBreakConst or stop.value:{:\nbreak\n:}loopBreak% += 1\n:}'
 <number> ::= <number><num>|<num>
 <num> ::= '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
-<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='|'is'|'is not'
+<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='
 <in_list_comp_op> ::= 'in'|'not in'
 <list_comp_op> ::= '=='|'!='
 <bool_var> ::= 'b0'|'b1'|'b2'
diff --git a/grammars/progsys/Digits.bnf b/grammars/progsys/Digits.bnf
index 669b1caa..2d6c48be 100644
--- a/grammars/progsys/Digits.bnf
+++ b/grammars/progsys/Digits.bnf
@@ -12,7 +12,7 @@
 <for> ::= 'loopBreak% = 0\nfor forCounter% in '<list_int>':{:\n'<code>'\nif loopBreak% > loopBreakConst or stop.value:{:\nbreak\n:}loopBreak% += 1\n:}'|'loopBreak% = 0\nfor '<int_var>' in '<list_int>':{:\n'<code>'\nif loopBreak% > loopBreakConst or stop.value:{:\nbreak\n:}loopBreak% += 1\n:}'
 <number> ::= <number><num>|<num>
 <num> ::= '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
-<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='|'is'|'is not'
+<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='
 <in_list_comp_op> ::= 'in'|'not in'
 <list_comp_op> ::= '=='|'!='
 <bool_var> ::= 'b0'|'b1'|'b2'
diff --git a/grammars/progsys/Double Letters.bnf b/grammars/progsys/Double Letters.bnf
index e2a83443..77392c98 100644
--- a/grammars/progsys/Double Letters.bnf	
+++ b/grammars/progsys/Double Letters.bnf	
@@ -9,7 +9,7 @@
 <assign> ::= <bool_var>' = '<bool>|<int_assign>|<string_var>' = '<string>
 <number> ::= <number><num>|<num>
 <num> ::= '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
-<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='|'is'|'is not'
+<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='
 <string_const_part> ::= <string_const_part><string_literal>|<string_literal>
 <bool_var> ::= 'b0'|'b1'|'b2'
 <bool> ::= <bool_var>|<bool_const>|'not '<bool>|'( '<bool>' '<bool_op>' '<bool>' )'|<int>' '<comp_op>' '<int>|<string>' in '<string>|<string>' not in '<string>|<string>' == '<string>|<string>' != '<string>|<string>'.startswith('<string>')'|<string>'.endswith('<string>')'
diff --git a/grammars/progsys/Even Squares.bnf b/grammars/progsys/Even Squares.bnf
index 669b1caa..2d6c48be 100644
--- a/grammars/progsys/Even Squares.bnf	
+++ b/grammars/progsys/Even Squares.bnf	
@@ -12,7 +12,7 @@
 <for> ::= 'loopBreak% = 0\nfor forCounter% in '<list_int>':{:\n'<code>'\nif loopBreak% > loopBreakConst or stop.value:{:\nbreak\n:}loopBreak% += 1\n:}'|'loopBreak% = 0\nfor '<int_var>' in '<list_int>':{:\n'<code>'\nif loopBreak% > loopBreakConst or stop.value:{:\nbreak\n:}loopBreak% += 1\n:}'
 <number> ::= <number><num>|<num>
 <num> ::= '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
-<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='|'is'|'is not'
+<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='
 <in_list_comp_op> ::= 'in'|'not in'
 <list_comp_op> ::= '=='|'!='
 <bool_var> ::= 'b0'|'b1'|'b2'
diff --git a/grammars/progsys/For Loop Index.bnf b/grammars/progsys/For Loop Index.bnf
index a89b89c3..93d6cea3 100644
--- a/grammars/progsys/For Loop Index.bnf	
+++ b/grammars/progsys/For Loop Index.bnf	
@@ -12,7 +12,7 @@
 <for> ::= 'loopBreak% = 0\nfor forCounter% in '<list_int>':{:\n'<code>'\nif loopBreak% > loopBreakConst or stop.value:{:\nbreak\n:}loopBreak% += 1\n:}'|'loopBreak% = 0\nfor '<int_var>' in '<list_int>':{:\n'<code>'\nif loopBreak% > loopBreakConst or stop.value:{:\nbreak\n:}loopBreak% += 1\n:}'
 <number> ::= <number><num>|<num>
 <num> ::= '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
-<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='|'is'|'is not'
+<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='
 <in_list_comp_op> ::= 'in'|'not in'
 <list_comp_op> ::= '=='|'!='
 <bool_var> ::= 'b0'|'b1'|'b2'
diff --git a/grammars/progsys/Grade.bnf b/grammars/progsys/Grade.bnf
index 856fd11f..070d0a57 100644
--- a/grammars/progsys/Grade.bnf
+++ b/grammars/progsys/Grade.bnf
@@ -9,7 +9,7 @@
 <assign> ::= <bool_var>' = '<bool>|<int_assign>|<string_var>' = '<string>
 <number> ::= <number><num>|<num>
 <num> ::= '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
-<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='|'is'|'is not'
+<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='
 <string_literal> ::= 'A'|'B'|'C'|'D'|'F'
 <bool_var> ::= 'b0'|'b1'|'b2'
 <bool> ::= <bool_var>|<bool_const>|'not '<bool>|'( '<bool>' '<bool_op>' '<bool>' )'|<int>' '<comp_op>' '<int>|<string>' in '<string>|<string>' not in '<string>|<string>' == '<string>|<string>' != '<string>|<string>'.startswith('<string>')'|<string>'.endswith('<string>')'
diff --git a/grammars/progsys/Last Index of Zero.bnf b/grammars/progsys/Last Index of Zero.bnf
index 469b2224..61668904 100644
--- a/grammars/progsys/Last Index of Zero.bnf	
+++ b/grammars/progsys/Last Index of Zero.bnf	
@@ -12,7 +12,7 @@
 <for> ::= 'loopBreak% = 0\nfor forCounter% in '<list_int>':{:\n'<code>'\nif loopBreak% > loopBreakConst or stop.value:{:\nbreak\n:}loopBreak% += 1\n:}'|'loopBreak% = 0\nfor '<int_var>' in '<list_int>':{:\n'<code>'\nif loopBreak% > loopBreakConst or stop.value:{:\nbreak\n:}loopBreak% += 1\n:}'
 <number> ::= <number><num>|<num>
 <num> ::= '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
-<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='|'is'|'is not'
+<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='
 <in_list_comp_op> ::= 'in'|'not in'
 <list_comp_op> ::= '=='|'!='
 <bool_var> ::= 'b0'|'b1'|'b2'
diff --git a/grammars/progsys/Median.bnf b/grammars/progsys/Median.bnf
index 94360304..ef6a9c31 100644
--- a/grammars/progsys/Median.bnf
+++ b/grammars/progsys/Median.bnf
@@ -8,7 +8,7 @@
 <assign> ::= <bool_var>' = '<bool>|<int_assign>
 <number> ::= <number><num>|<num>
 <num> ::= '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
-<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='|'is'|'is not'
+<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='
 <bool_var> ::= 'b0'|'b1'|'b2'
 <bool> ::= <bool_var>|<bool_const>|'not '<bool>|'( '<bool>' '<bool_op>' '<bool>' )'|<int>' '<comp_op>' '<int>
 <bool_op> ::= 'and'|'or'
diff --git a/grammars/progsys/Mirror Image.bnf b/grammars/progsys/Mirror Image.bnf
index 46c78738..49e8bfd4 100644
--- a/grammars/progsys/Mirror Image.bnf	
+++ b/grammars/progsys/Mirror Image.bnf	
@@ -12,7 +12,7 @@
 <for> ::= 'loopBreak% = 0\nfor forCounter% in '<list_int>':{:\n'<code>'\nif loopBreak% > loopBreakConst or stop.value:{:\nbreak\n:}loopBreak% += 1\n:}'|'loopBreak% = 0\nfor '<int_var>' in '<list_int>':{:\n'<code>'\nif loopBreak% > loopBreakConst or stop.value:{:\nbreak\n:}loopBreak% += 1\n:}'
 <number> ::= <number><num>|<num>
 <num> ::= '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
-<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='|'is'|'is not'
+<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='
 <in_list_comp_op> ::= 'in'|'not in'
 <list_comp_op> ::= '=='|'!='
 <bool_var> ::= 'b0'|'b1'|'b2'|'res0'
diff --git a/grammars/progsys/Negative To Zero.bnf b/grammars/progsys/Negative To Zero.bnf
index 1a953740..14bb945b 100644
--- a/grammars/progsys/Negative To Zero.bnf	
+++ b/grammars/progsys/Negative To Zero.bnf	
@@ -12,7 +12,7 @@
 <for> ::= 'loopBreak% = 0\nfor forCounter% in '<list_int>':{:\n'<code>'\nif loopBreak% > loopBreakConst or stop.value:{:\nbreak\n:}loopBreak% += 1\n:}'|'loopBreak% = 0\nfor '<int_var>' in '<list_int>':{:\n'<code>'\nif loopBreak% > loopBreakConst or stop.value:{:\nbreak\n:}loopBreak% += 1\n:}'
 <number> ::= <number><num>|<num>
 <num> ::= '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
-<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='|'is'|'is not'
+<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='
 <in_list_comp_op> ::= 'in'|'not in'
 <list_comp_op> ::= '=='|'!='
 <bool_var> ::= 'b0'|'b1'|'b2'
diff --git a/grammars/progsys/Pig Latin.bnf b/grammars/progsys/Pig Latin.bnf
index 03468248..55d907f8 100644
--- a/grammars/progsys/Pig Latin.bnf	
+++ b/grammars/progsys/Pig Latin.bnf	
@@ -9,7 +9,7 @@
 <assign> ::= <bool_var>' = '<bool>|<int_assign>|<string_var>' = '<string>
 <number> ::= <number><num>|<num>
 <num> ::= '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
-<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='|'is'|'is not'
+<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='
 <string_const_part> ::= <string_const_part><string_literal>|<string_literal>
 <bool_var> ::= 'b0'|'b1'|'b2'
 <bool> ::= <bool_var>|<bool_const>|'not '<bool>|'( '<bool>' '<bool_op>' '<bool>' )'|<int>' '<comp_op>' '<int>|<string>' in '<string>|<string>' not in '<string>|<string>' == '<string>|<string>' != '<string>|<string>'.startswith('<string>')'|<string>'.endswith('<string>')'
diff --git a/grammars/progsys/Replace Space with Newline.bnf b/grammars/progsys/Replace Space with Newline.bnf
index c048bf78..6e754ae2 100644
--- a/grammars/progsys/Replace Space with Newline.bnf	
+++ b/grammars/progsys/Replace Space with Newline.bnf	
@@ -9,7 +9,7 @@
 <assign> ::= <bool_var>' = '<bool>|<int_assign>|<string_var>' = '<string>
 <number> ::= <number><num>|<num>
 <num> ::= '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
-<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='|'is'|'is not'
+<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='
 <string_const_part> ::= <string_const_part><string_literal>|<string_literal>
 <bool_var> ::= 'b0'|'b1'|'b2'
 <bool> ::= <bool_var>|<bool_const>|'not '<bool>|'( '<bool>' '<bool_op>' '<bool>' )'|<int>' '<comp_op>' '<int>|<string>' in '<string>|<string>' not in '<string>|<string>' == '<string>|<string>' != '<string>|<string>'.startswith('<string>')'|<string>'.endswith('<string>')'
diff --git a/grammars/progsys/Scrabble Score.bnf b/grammars/progsys/Scrabble Score.bnf
index a6dfc5ab..313143cb 100644
--- a/grammars/progsys/Scrabble Score.bnf	
+++ b/grammars/progsys/Scrabble Score.bnf	
@@ -13,7 +13,7 @@
 <for> ::= 'loopBreak% = 0\nfor forCounter% in '<list_int>':{:\n'<code>'\nif loopBreak% > loopBreakConst or stop.value:{:\nbreak\n:}loopBreak% += 1\n:}'|'loopBreak% = 0\nfor '<int_var>' in '<list_int>':{:\n'<code>'\nif loopBreak% > loopBreakConst or stop.value:{:\nbreak\n:}loopBreak% += 1\n:}'
 <number> ::= <number><num>|<num>
 <num> ::= '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
-<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='|'is'|'is not'
+<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='
 <string_const_part> ::= <string_const_part><string_literal>|<string_literal>
 <in_list_comp_op> ::= 'in'|'not in'
 <list_comp_op> ::= '=='|'!='
diff --git a/grammars/progsys/Small Or Large.bnf b/grammars/progsys/Small Or Large.bnf
index 76e21789..1f57d61b 100644
--- a/grammars/progsys/Small Or Large.bnf	
+++ b/grammars/progsys/Small Or Large.bnf	
@@ -9,7 +9,7 @@
 <assign> ::= <bool_var>' = '<bool>|<int_assign>|<string_var>' = '<string>
 <number> ::= <number><num>|<num>
 <num> ::= '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
-<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='|'is'|'is not'
+<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='
 <string_const_part> ::= <string_const_part><string_literal>|<string_literal>
 <bool_var> ::= 'b0'|'b1'|'b2'
 <bool> ::= <bool_var>|<bool_const>|'not '<bool>|'( '<bool>' '<bool_op>' '<bool>' )'|<int>' '<comp_op>' '<int>|<string>' in '<string>|<string>' not in '<string>|<string>' == '<string>|<string>' != '<string>|<string>'.startswith('<string>')'|<string>'.endswith('<string>')'
diff --git a/grammars/progsys/Smallest.bnf b/grammars/progsys/Smallest.bnf
index 0e4f84a7..99d50d90 100644
--- a/grammars/progsys/Smallest.bnf
+++ b/grammars/progsys/Smallest.bnf
@@ -8,7 +8,7 @@
 <assign> ::= <bool_var>' = '<bool>|<int_assign>
 <number> ::= <number><num>|<num>
 <num> ::= '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
-<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='|'is'|'is not'
+<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='
 <bool_var> ::= 'b0'|'b1'|'b2'
 <bool> ::= <bool_var>|<bool_const>|'not '<bool>|'( '<bool>' '<bool_op>' '<bool>' )'|<int>' '<comp_op>' '<int>
 <bool_op> ::= 'and'|'or'
diff --git a/grammars/progsys/String Differences.bnf b/grammars/progsys/String Differences.bnf
index 93aefa6d..54a747b8 100644
--- a/grammars/progsys/String Differences.bnf	
+++ b/grammars/progsys/String Differences.bnf	
@@ -9,7 +9,7 @@
 <assign> ::= <bool_var>' = '<bool>|<int_assign>|<string_var>' = '<string>
 <number> ::= <number><num>|<num>
 <num> ::= '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
-<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='|'is'|'is not'
+<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='
 <string_const_part> ::= <string_const_part><string_literal>|<string_literal>
 <bool_var> ::= 'b0'|'b1'|'b2'
 <bool> ::= <bool_var>|<bool_const>|'not '<bool>|'( '<bool>' '<bool_op>' '<bool>' )'|<int>' '<comp_op>' '<int>|<string>' in '<string>|<string>' not in '<string>|<string>' == '<string>|<string>' != '<string>|<string>'.startswith('<string>')'|<string>'.endswith('<string>')'
diff --git a/grammars/progsys/String Lengths Backwards.bnf b/grammars/progsys/String Lengths Backwards.bnf
index c178e7e3..90b3ff9a 100644
--- a/grammars/progsys/String Lengths Backwards.bnf	
+++ b/grammars/progsys/String Lengths Backwards.bnf	
@@ -14,7 +14,7 @@
 <for> ::= 'loopBreak% = 0\nfor forCounter% in '<list_int>':{:\n'<code>'\nif loopBreak% > loopBreakConst or stop.value:{:\nbreak\n:}loopBreak% += 1\n:}'|'loopBreak% = 0\nfor '<int_var>' in '<list_int>':{:\n'<code>'\nif loopBreak% > loopBreakConst or stop.value:{:\nbreak\n:}loopBreak% += 1\n:}'|'loopBreak% = 0\nfor forCounter% in '<list_string>':{:\n'<code>'\nif loopBreak% > loopBreakConst or stop.value:{:\nbreak\n:}loopBreak% += 1\n:}'|'loopBreak% = 0\nfor '<string_var>' in '<list_string>':{:\n'<code>'\nif loopBreak% > loopBreakConst or stop.value:{:\nbreak\n:}loopBreak% += 1\n:}'
 <number> ::= <number><num>|<num>
 <num> ::= '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
-<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='|'is'|'is not'
+<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='
 <string_const_part> ::= <string_const_part><string_literal>|<string_literal>
 <in_list_comp_op> ::= 'in'|'not in'
 <list_comp_op> ::= '=='|'!='
diff --git a/grammars/progsys/Sum of Squares.bnf b/grammars/progsys/Sum of Squares.bnf
index 8b0b4be9..af4c1047 100644
--- a/grammars/progsys/Sum of Squares.bnf	
+++ b/grammars/progsys/Sum of Squares.bnf	
@@ -8,7 +8,7 @@
 <assign> ::= <bool_var>' = '<bool>|<int_assign>
 <number> ::= <number><num>|<num>
 <num> ::= '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
-<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='|'is'|'is not'
+<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='
 <bool_var> ::= 'b0'|'b1'|'b2'
 <bool> ::= <bool_var>|<bool_const>|'not '<bool>|'( '<bool>' '<bool_op>' '<bool>' )'|<int>' '<comp_op>' '<int>
 <bool_op> ::= 'and'|'or'
diff --git a/grammars/progsys/Super Anagrams.bnf b/grammars/progsys/Super Anagrams.bnf
index 83fdf6b1..2a9c3737 100644
--- a/grammars/progsys/Super Anagrams.bnf	
+++ b/grammars/progsys/Super Anagrams.bnf	
@@ -9,7 +9,7 @@
 <assign> ::= <bool_var>' = '<bool>|<int_assign>|<string_var>' = '<string>
 <number> ::= <number><num>|<num>
 <num> ::= '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
-<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='|'is'|'is not'
+<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='
 <string_const_part> ::= <string_const_part><string_literal>|<string_literal>
 <bool_var> ::= 'b0'|'b1'|'b2'|'res0'
 <bool> ::= <bool_var>|<bool_const>|'not '<bool>|'( '<bool>' '<bool_op>' '<bool>' )'|<int>' '<comp_op>' '<int>|<string>' in '<string>|<string>' not in '<string>|<string>' == '<string>|<string>' != '<string>|<string>'.startswith('<string>')'|<string>'.endswith('<string>')'
diff --git a/grammars/progsys/Syllables.bnf b/grammars/progsys/Syllables.bnf
index c4db7000..cbc97963 100644
--- a/grammars/progsys/Syllables.bnf
+++ b/grammars/progsys/Syllables.bnf
@@ -9,7 +9,7 @@
 <assign> ::= <bool_var>' = '<bool>|<int_assign>|<string_var>' = '<string>
 <number> ::= <number><num>|<num>
 <num> ::= '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
-<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='|'is'|'is not'
+<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='
 <string_const_part> ::= <string_const_part><string_literal>|<string_literal>
 <bool_var> ::= 'b0'|'b1'|'b2'
 <bool> ::= <bool_var>|<bool_const>|'not '<bool>|'( '<bool>' '<bool_op>' '<bool>' )'|<int>' '<comp_op>' '<int>|<string>' in '<string>|<string>' not in '<string>|<string>' == '<string>|<string>' != '<string>|<string>'.startswith('<string>')'|<string>'.endswith('<string>')'
diff --git a/grammars/progsys/Wallis Pi.bnf b/grammars/progsys/Wallis Pi.bnf
index 80213072..6d1b329f 100644
--- a/grammars/progsys/Wallis Pi.bnf	
+++ b/grammars/progsys/Wallis Pi.bnf	
@@ -9,7 +9,7 @@
 <assign> ::= <bool_var>' = '<bool>|<int_assign>|<float_assign>
 <number> ::= <number><num>|<num>
 <num> ::= '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
-<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='|'is'|'is not'
+<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='
 <bool_var> ::= 'b0'|'b1'|'b2'
 <bool> ::= <bool_var>|<bool_const>|'not '<bool>|'( '<bool>' '<bool_op>' '<bool>' )'|<int>' '<comp_op>' '<int>|<float>' '<comp_op>' '<float>|<int>' '<comp_op>' '<float>|<float>' '<comp_op>' '<int>
 <bool_op> ::= 'and'|'or'
diff --git a/grammars/progsys/Word Stats.bnf b/grammars/progsys/Word Stats.bnf
index cd8ad0c8..536fb0f2 100644
--- a/grammars/progsys/Word Stats.bnf	
+++ b/grammars/progsys/Word Stats.bnf	
@@ -16,7 +16,7 @@
 <for> ::= 'loopBreak% = 0\nfor forCounter% in '<list_int>':{:\n'<code>'\nif loopBreak% > loopBreakConst or stop.value:{:\nbreak\n:}loopBreak% += 1\n:}'|'loopBreak% = 0\nfor '<int_var>' in '<list_int>':{:\n'<code>'\nif loopBreak% > loopBreakConst or stop.value:{:\nbreak\n:}loopBreak% += 1\n:}'|'loopBreak% = 0\nfor forCounter% in '<list_float>':{:\n'<code>'\nif loopBreak% > loopBreakConst or stop.value:{:\nbreak\n:}loopBreak% += 1\n:}'|'loopBreak% = 0\nfor '<float_var>' in '<list_float>':{:\n'<code>'\nif loopBreak% > loopBreakConst or stop.value:{:\nbreak\n:}loopBreak% += 1\n:}'|'loopBreak% = 0\nfor forCounter% in '<list_string>':{:\n'<code>'\nif loopBreak% > loopBreakConst or stop.value:{:\nbreak\n:}loopBreak% += 1\n:}'|'loopBreak% = 0\nfor '<string_var>' in '<list_string>':{:\n'<code>'\nif loopBreak% > loopBreakConst or stop.value:{:\nbreak\n:}loopBreak% += 1\n:}'
 <number> ::= <number><num>|<num>
 <num> ::= '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
-<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='|'is'|'is not'
+<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='
 <string_const_part> ::= <string_const_part><string_literal>|<string_literal>
 <in_list_comp_op> ::= 'in'|'not in'
 <list_comp_op> ::= '=='|'!='
diff --git a/grammars/progsys/X-Word Lines.bnf b/grammars/progsys/X-Word Lines.bnf
index b60db411..66aa3575 100644
--- a/grammars/progsys/X-Word Lines.bnf	
+++ b/grammars/progsys/X-Word Lines.bnf	
@@ -9,7 +9,7 @@
 <assign> ::= <bool_var>' = '<bool>|<int_assign>|<string_var>' = '<string>
 <number> ::= <number><num>|<num>
 <num> ::= '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
-<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='|'is'|'is not'
+<comp_op> ::= '<'|'>'|'=='|'>='|'<='|'!='
 <string_const_part> ::= <string_const_part><string_literal>|<string_literal>
 <bool_var> ::= 'b0'|'b1'|'b2'
 <bool> ::= <bool_var>|<bool_const>|'not '<bool>|'( '<bool>' '<bool_op>' '<bool>' )'|<int>' '<comp_op>' '<int>|<string>' in '<string>|<string>' not in '<string>|<string>' == '<string>|<string>' != '<string>|<string>'.startswith('<string>')'|<string>'.endswith('<string>')'