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Irregular dots Sudoku (775)
Instruction:
Follow irrregular sudoku rules. Rows and columns are marked with numbers 1 to 9. There is a white dot between two cells if the difference of the digits they contain is equal to the number of a row they are part of. There is a black dot between two cells if the sum of the digits they contain is equal to the number of a row they are part of. The same applies to the columns. All possible dots are drawn.