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15 puzzle
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==External links== {{Commons category}} * [https://hc11.home.xs4all.nl/15puzzle/15puzzen.htm The history of the 15 puzzle] * [https://15puzzle.codingbroz.com/ 15 Puzzle Game] * [http://www.chessandpoker.com/fifteen-puzzle-solution.html Fifteen Puzzle Solution] * [http://oeis.org/A151944 Maximal number of moves required for the m X n generalization of the 15 puzzle] * [http://kociemba.org/themen/fifteen/fifteensolver.html 15-Puzzle Optimal Solver] with download (from Herbert Kociemba) [[Category:Mechanical puzzles]] [[Category:Combination puzzles]] [[Category:NP-complete problems]] [[Category:Permutations]] [[Category:19th-century fads and trends]]
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