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Mysterious Sum and Difference Sudoku (1281)
Instruction:
Apply classic sudoku rules. If the sum of adjacent digits is S, a black dot is given between the cells. If the difference of adjacent digits is D, a white dot is given between the cells. All possible white and black dots are given. It is part of solving to determine the values of S and D. Values of S and D may be the same.
The case where adjacent cells contain digits whose both sum is S and difference is D will not happen.