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Offspring (168)
Instruction:
Place a number from 1 to 9 into each cell. Cells containing the same number cannot touch (along an edge or corner). For any two distinct numbers, every cell containing the larger number must touch at least one cell containing the smaller number. (For example, a cell that contains a 5 must touch a 4, a 3, a 2, and a 1.) Some numbers may be already filled in the grid.