5 + 0 = - 5, 9 + 0 = - 9, 12 + 0 = - 12, 3 + 0 = - 3, 14 + 0 = - 14, 19 + 0 = - 19, 6 - 0 = - 6, 15 - 0 = - 15, 20 - 0 = - 20, 4 - 0 = - 4 , 8 - 0 = - 8, 16 - 0 = - 16, 11 - 0 = - 11,

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