9 + 8 =, 17, 10 - 7 =, 3, 8 + 5 =, 13, 18 + 2 =, 20, 17 - 5 =, 12, 12 + 7 =, 19, 19 - 5 =, 14, 5 + 5 =, 10, 14 - 7 =, 7, 15 - 10 =, 5.

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