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sudoku combinations The objective is to fill the grid with numbers from 1 to 9, ensuring that each number appears exactly once in each row, column, and subgrid. sudoku x wing explanation Use a pencil: Since you might make mistakes along the way, using a pencil allows you to erase and correct errors easily. By cross-hatching, you can eliminate these numbers from other cells in the same row, column, or box, making the puzzle easier to solve. chicago sun sudoku
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