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

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