40 + 50 = - 90, 10 + 20 = - 30, 50 + 50 = - 100, 60 + 20 = - 80, 30 + 40 = - 70, 10 + 0 =  - 10, 10 + 10 = - 20, 30 + 10 = - 40, 40 + 10 = - 50, 40 + 20 =  - 60,

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