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Hat puzzle
logical deduction - Four prisoners wearing black and white hats - Puzzling Stack Exchange
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Solve this puzzle - Gaming | Brain teasers riddles, Jokes and riddles, Brain teasers
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4 Criminals are caught wearing 2 white and 2 black hats | Puzzles World
The Weirdest Consequence of the Axiom of Choice – Rising Entropy
Hat Puzzles – puzzlewocky
