1 + 1 = - 2, 0 + 1 = - 1, 3 + 5 = - 8, 5 + 7 =  - 12, 2 + 2 = - 4, 3 + 3 = - 6, 3 + 4 = - 7, 2 + 1 = - 3, 8 + 2 = - 10, 9 + 2 = - 11,

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