Add single-rule test cases

benchmark/samples/block-bq-flat.md

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+> the simple example of a blockquote 
+> the simple example of a blockquote
+> the simple example of a blockquote
+> the simple example of a blockquote
+... continuation
+... continuation
+... continuation
+... continuation
+
+empty blockquote:
+
+>
+>
+>
+>
+

benchmark/samples/block-bq-nested.md

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+>>>>>> deeply nested blockquote
+>>>>> deeply nested blockquote
+>>>> deeply nested blockquote
+>>> deeply nested blockquote
+>> deeply nested blockquote
+> deeply nested blockquote
+
+> deeply nested blockquote
+>> deeply nested blockquote
+>>> deeply nested blockquote
+>>>> deeply nested blockquote
+>>>>> deeply nested blockquote
+>>>>>> deeply nested blockquote

benchmark/samples/block-code.md

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+
+        an
+        example
+
+        of
+
+
+
+        a code
+        block
+

benchmark/samples/block-fences.md

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+
+``````````text
+an
+example
+```
+of
+
+
+a fenced
+```
+code
+block
+``````````
+

benchmark/samples/block-heading.md

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+# heading
+### heading
+##### heading
+
+# heading #
+### heading ###
+##### heading \#\#\#\#\######
+
+############ not a heading

benchmark/samples/block-hr.md

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+
+ * * * * *
+
+ -  -  -  -  -
+
+ ________
+
+
+ ************************* text
+

benchmark/samples/block-lheading.md

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+heading
+---
+
+heading
+===================================
+
+not a heading
+----------------------------------- text

benchmark/samples/inline-backticks.md

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+`lots`of`backticks`
+
+``i``wonder``how``this``will``be``parsed``

benchmark/samples/inline-em-flat.md

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+*this* *is* *your* *basic* *boring* *emphasis*
+
+_this_ _is_ _your_ _basic_ _boring_ _emphasis_
+
+**this** **is** **your** **basic** **boring** **emphasis**

benchmark/samples/inline-em-nested.md

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+*this *is *a *bunch* of* nested* emphases* 
+
+__this __is __a __bunch__ of__ nested__ emphases__ 
+
+***this ***is ***a ***bunch*** of*** nested*** emphases*** 

benchmark/samples/inline-em-worst.md

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+*this *is *a *worst *case *for *em *backtracking
+
+__this __is __a __worst __case __for __em __backtracking
+
+***this ***is ***a ***worst ***case ***for ***em ***backtracking

benchmark/samples/inline-escape.md

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+
+\t\e\s\t\i\n\g \e\s\c\a\p\e \s\e\q\u\e\n\c\e\s
+
+\!\\\"\#\$\%\&\'\(\)\*\+\,\.\/\:\;\<\=\>\?
+
+\@ \[ \] \^ \_ \` \{ \| \} \~ \- \'
+
+\
+\\
+\\\
+\\\\
+\\\\\
+