Blame tests/mem_r.txt

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First we push a lot on the stack by nesting parenthesis:
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((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((
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((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((
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(((((((((((((((((((((((((((((((((((((((((((
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(should be 200 states pushed here)
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))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
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))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
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)))))))))))))))))))))))))))))))))))))))))))
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Now we match progressively bigger tokens to increase the read buffer:
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len=1    0
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len=2    00
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len=4    0000
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len=8    00000000
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len=16   0000000000000000
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len=32   00000000000000000000000000000000
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len=64   0000000000000000000000000000000000000000000000000000000000000000
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len=128  00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
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len=256  0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
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len=512  00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
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len=1024 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000