14 - 6 = - 8, 15 - 8 = - 7, 17 - 8 = - 9, 13 - 7 = - 6, 12 - 7 = - 5, 17 - 3 = - 14, 13 - 9 = - 4, 11 - 8 = - 3, 11 - 9 = - 2, 16 - 15 = - 1, 18 - 6 = - 12, 15 - 2 = - 13,

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