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Monospaced non-alphanumeric characters
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--------------------------------------
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These are all ASCII characters except a-zA-Z0-9 and space:
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``!!!"""###$$$%%%&&&'''((()))***+++,,,---...///:::``
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``;;;<<<===>>>???@@@[[[\\\]]]^^^___```{{{|||}}}~~~``
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``xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx``
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The two lines of non-alphanumeric characters should both have the same
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width as the third line.