Sudoku is a popular oriental game, where you need to feel squares with numbers. You 9x9 field is divided into 9 3x3 areas. You can put numbers 1 to 9 into empty squares. The numbers you put must be arranged in such way that each 3x3 area, each row and each column will have 9 different numbers. In other words, you can not put a 3 if there's another 3 in the same area, the same row or the same column.
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