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Diagonal pairs Sudoku (793)
Instruction:
Follow classic sudoku rules. There are exactly 13 pairs of cells in the grid (15 in example) satisfying the following conditions: one cell is grey, one cell is white, both contain the same digit, which is equal to the diagonal distance between the cells. There is no such pair with both cells white or both cells grey. Each digit from 1 to 8 appears at least once in a grey cell. Each cell / digit belongs to at most one pair.