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The famously difficult green-eyed logic puzzle / Boing Boing
boingboing.net/2015/06/18/the-famously-difficult-green-e.html
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D
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The correct answer to xkcd's Hardest Logic Puzzle in the World - Incredulous
skepticink.com/incredulous/2015/09/18/the-correct-answer-to-xkcds-hard..

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Philosophy common knowledge Logic
Link by Ed Clint

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