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David Singmaster
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Jerry Slocum
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Puzzle Panel
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Missionaries and cannibals problem
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Professor's Cube
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Speedcubing
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List of conjectures
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The Adventure Game
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D. H. Lehmer
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Optimal solutions for the Rubik's Cube
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Rubik's Revenge
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Birthday problem
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Rubik's Cube
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Martin Gardner
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Luca Pacioli
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Binomial coefficient
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