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Sometimes spelled 'Su Doku', is a placement puzzle also know as 'Number Place' in the United States. The aim of the puzzle
is to enter a numeral from 1 to 9 in each cell of a grid, most frequently a 9X9 grid made up of 3X3 subgrids (called "regions"),
starting with various numerals given in some cells (the "givens"). Each row, column, and region must contain only
one instance of each numeral. Completing the puzzle requires patience and logical ability. Sudoku initially became popular
in Japan in 1986 and attained international popularity in 2005.
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