21 plus 20, 32 plus 40, 50 plus 50, 25 plus 25, 35 plus 10, 50 plus 40, 40 plus 30, 50 plus 35, 100 minus 30, 100 minus 20, 50 minus 30, 70 minus 20, 90 minus 50, 60 minus 10, 100 minus 15, 40 minus 10

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