8, 10 - 2 =, 15, 17 - 2 =, 5, 11 - 6 =, 4, 9 - 5 =, 2, 4 - 2 =, 7, 17 - 10 =, 3, 4 - 1 =, 13, 15 - 2 =, 10, 11 - 1 =, 6, 7 - 1 =

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