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In other words, they are the only cells in their row, column, or region that can contain those numbers. scientific american killer sudokusudoku generator To do this, simply note down the numbers 1 through 9 in each empty cell, keeping in mind that each number must appear only once in each row, column, and 3x3 subgrid. Single Removal: If a number can only go in one cell in a row, column, or subgrid, remove all other possible numbers from that cell. sudoku print free
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