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Doppelblock (Product) (1081)
Instruction:
Place either a block or a number from 1 to X (integers only) into each cell so that each number appears exactly once in each row and each column. (X is two fewer than the number of cells in each row.) Each row and each column will therefore have exactly two cells with blocks in them. Some cells may already be filled in for you.
The numbers outside the grid indicate the product of the numbers between the two blocks in that row or column. If there are no numbers between the blocks, the product should be considered to be 1.