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Sudoku (pronounced soo-dough-coo with the emphasis on the first syllable) is a
simple number-based puzzle/game played on a 9x9 grid that is divided into 3x3
subgrids. The goal is to enter a number from 1 to 9 in each cell so that each
number appears only once in each column and row. In addition, each 3x3 subgrid
may only contain one of each number.
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