3 + 5 = - 8, 9 + 9 = - 18, 5 + 4 = - 9, 8 + 6 = - 14, 6 + 1 = - 7, 7 + 8 = - 15, 4 + 6 = - 10, 9 + 4 = - 13, 6 + 6 = - 12, 2 + 9 = - 11,

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