2 + 3 = - 5, 4 + 2 = - 6, 3 + 4 = - 7, 3 + 5 = - 8, 5 + 4 = - 9, 2 + 8 = - 10, 5 + 6 = - 11, 4 + 8 = - 12, 6 + 7 = - 13, 7 + 7 = - 14, 6 + 9 = - 15, 8 + 8 = - 16, 8 + 9 = - 17, 8 + 10 = - 18, 9 + 10 = - 19, 10 + 10 = - 20,

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