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sudoku hidden pairs These techniques involve identifying patterns of numbers that can be eliminated from rows or columns, significantly reducing the number of possible placements. sudoku 247 expert winter Use pencil marks : Keep track of potential numbers in each cell by marking them lightly with a pencil.
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If a particular number appears more than once in a row, column, or subgrid, it can be eliminated from other cells in that respective area. sudoku hidden pairs Naked Quadruples: Identify four cells with four possible numbers, and eliminate those numbers from the other cells in the same row, column, or subgrid. sudoku with letters and numbers
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