3 + (-5) = -2, 3 + 4 = 7, 3 + (-7) = -4, -3 + (-4) = -7, -3 + 6 = 3, -3 + 8 = 5, -3 + 3 = 0, 2 + 3 = 5, -1 + 4 = 3, -1 + -3 = -4, 5 + (-5) = 0, -5 + 7 = 2, 1 + (-3) = -2, -5 + (-4) = -9, -4 + 7 = 3,

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