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Pigeonhole Principle: If there are only two possible numbers left in a row, column, or subgrid, one of them must go in a specific cell. boston globe sudoku The objective is to fill a 9x9 grid with numbers from 1 to 9, such as in the following example: +---+---+---+ | | | | +---+---+---+ | | | | +---+---+---+ | | | | +---+---+---+ | | | | +---+---+---+ | | | | +---+---+---+ The numbers must be placed in such a way that each row, column, and 3x3 subgrid contain all the digits from 1 to 9 without repetition. printable blank sudoku
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