1 + 1 = - 2, 3 + 3 = - 6, 5 + 5 = - 10, 8 + 8 = - 16, 2 + 2 = - 4, 9 + 9 = - 18, 4 + 4 = - 8, 6 + 6 = - 12, 10 + 10 = - 20, 7 + 7 = - 14,

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