Normal sudoku rules apply. Digits in a cage must not repeat and no two cages may sum to the same total. No cage sums to its own clue, but receives help from exactly one other cage. That is, the clue indicates the sum of the cage it is in plus the total of a helper cage, which is another cage to be determined by the solver. Each cage helps exactly one other cage. Cells outside the grid can be used for note-taking.
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