brainfuck commands
| > | increment pointer
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| < | decrement pointer
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| + | increment value at pointer
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| - | decrement value at pointer
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| [ | begin loop (continues while value at pointer is non-zero)
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| ] | end loop
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| , | read one character from input into value at pointer
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| . | print value at pointer to output as a character
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| # | display debugging info (in debug mode)
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| Any other characters are ignored. |