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

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