Fifteen Puzzle Stock Photo - Download Image Now - iStock
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Steven Strogatz on Twitter: "Remember playing the 15 puzzle as a kid? The one where you slide 15 little square tiles around inside a rectangle? @KahleMatthew and colleagues have a new preprint
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File:15-puzzle.svg - Wikimedia Commons
Amazon.co.jp: Toyoki Woodworking Sliding Puzzle Made of Wood, 15 Puzzles, Hinoki Wood, Made in Japan : Toys & Games
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Fifteen Puzzle Stock Photo - Download Image Now - iStock