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Offset Sudoku 9x9 (1)
Fill in the grid so that every row , every column , and every 3x3 box contains the digits 1 through 9. Offset Sudoku contains 9 disjoint groups in the puzzle, one for each relative box position. Each group has a distinct color. The group of 9 cells with the same color must also contain digits 1 through 9.

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