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He also bruteforced the entire opcode space to find undocumented instructions (sandsifter).
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Also came up with the original ..cantor.dust.. binary visualization tool, which is a tool I never used directly but Chris' presentation of it in 2012 is still one of the coolest talks I've ever seen.

[0] https://github.com/Battelle/cantordust

[1] https://www.youtube.com/watch?v=4bM3Gut1hIk

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