Buddy Cells
In a given Sudoku, every cell in the grid has 20 buddy cells. The buddy cells are highlighted in green in the given image below. In the example the number 1 is in cell R1C1 (R1C1 being Row 1 and Column 1) All the green cells are buddy cells to R1C1 and cannot contain the number which is already there in R1C1.
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