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Step 4: Use the Pencil Technique As you solve the puzzle, it's essential to keep track of the potential numbers for each cell. free sudoku print outpennydellpuzzles com sudoku For example, if you know that a row or column contains the numbers 1, 3, 5, and 7, you can deduce that the missing number must be 2, 4, 6, or 8. Learn from Your Mistakes: If you have made a mistake, the answer key can help you identify the error and learn how to avoid similar mistakes in the future. la times free sudoku
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