11 + 6 = - 17, 6 + 5 = - 11, 9 + 4 = - 13, 5 + 9 = - 14, 17 + 2 = - 19, 7 + 8 = - 15, 11 + 5 = - 16, 15 + 5 = - 20, 8 + 4 = - 12, 9 + 9 = - 18,

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