3 + 4 = - 7, 2 + 3= - 5, 1 + 2 = - 3, 4 + 5 = - 9, 8 + 9 =  - 17, 6 + 7 = - 13, 5 + 6 = - 11, 9 + 10 = - 19, 7 + 8 = - 15, 10 + 11= - 21,

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