Can't seem to figure out how the reverse or block works unfortunately, just stuc... | Hacker News

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Strikingwolf on Sept 28, 2015 | parent | context | favorite | on: The Incredible Proof Machine

Can't seem to figure out how the reverse or block works unfortunately, just stuck on A | B -> B | A

zyzor on Oct 3, 2015 [–]

Here are two ways to proof it: http://postimg.org/image/c4ghgyw8r/

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