15 - 14 =, 1, 2, 3, 10, 20 - 13 =, 7, 8, 11, 13, 1 - 0 =, 1, 2, 5, 6, 18 - 6 =, 4, 9, 11, 12, 11 - 9 =, 2, 6, 7, 9

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