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Sudoku N (428)
Instruction:
Apply classic sudoku rules. If any operation (+, -, x, /) performed between two orthogonally adjacent cells leads to a result of N, then the two cells are separated by a grey circle. If there is no grey circle, the result can not be N. The number N can be any integer in the range from 1-9. N is not given. It is part of solving to determine N.