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Doppelblock (unknown set) (943)
Instruction:
Place either a block or a number from 1 to X (integers only) into each cell. (X is the number of cells in each row.) Each row and each column should have exactly two cells with blocks in them. The numbers outside the grid indicate the sum of the numbers between the two blocks in that row or column. Some cells may already be filled in for you.
The set of numbers in each row and column are the same and are for you to determine. Numbers may not repeat within a row or column.