8, 10 - 2 =, 4, 8 - 4 =, 1, 10 - 9 =, 5, 15 - 10 =, 12, 15 - 3 =, 6, 15 - 9 =, 9, 17 - 8 =, 13, 20 - 7 =, 15, 20 - 5 =, 17, 20 - 3 =

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