Each box gets a number depending on the grid size (for a 6x6 puzzle, use numbers 1-6). Do not repeat a number in any row/column. Numbers in each heavily outlined set of squares (called cages) must combine to produce the target number in the top left corner using the mathematical operation indicated. Single digits in single cages should be written in first. A number can be repeated within a cage as long as it is not repeated in the same row or column.
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