11 + 11, 17 - 9, 9 + 4, 10 + 11, 7 + 3, 16 - 13, 7 + 8, 20 + 10, 10 + 4, 19 - 5, 30 - 14, 40 - 20, 5 +3, 7 + 7, 6 +6 .

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