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Kropki Pairs Sudoku (1110)
Instruction:
Apply classic sudoku rules. Adjacent cells containing digits whose difference is 1 are marked with a white circle. Adjacent cells containing digits whose ratio is 2 are marked with a black circle. A circle between between a 1 and a 2 can be either white or black.
Not all dots are given. In other words, adjacent cells with no marking may contain digits either whose difference is 1 or whose ratio is 2.