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Divisible Neighbour Sums Sudoku (1267)
Instruction:
Apply classic sudoku rules. All cells containing a digit that is a divisor of the sum of the digits orthogonally adjacent to it have been shaded grey. For example: a grey cell containing 3 can be orthogonally adjacent to 1,4 and 7 but a white cell containing 4 cannot be orthogonally adjacent to 2,6,8,8.