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Magic square
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==Solving partially completed magic squares== Solving partially completed magic squares is a popular mathematical pastime. The techniques needed are similar to those used in [[Sudoku]] or [[KenKen]] puzzles, and involve deducing the values of unfilled squares using logic and [[permutation group|permutation group theory]] (Sudoku grids are ''not'' magic squares but are based on a related idea called [[Graeco-Latin square]]s).<ref name=sudoku/>
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