15 - 5 = , 10, 5, 10 + 5 =, 10, 15, 15 - 10 = , 5, 10, 14 - 4 = , 10, 4, 10 + 4 =, 14, 10, 14 - 10 = , 10, 4, 12 - 2 = , 2, 10, 10 + 2 = , 10, 12, 12 - 10 = , 2, 10, 17 - 7 = , 10, 7, 10 + 7 = , 10, 17, 17 - 10 = , 10, 7, 18 - 8 = , 10, 8, 10 + 8 = , 18, 10, 18 - 10 = , 10, 8, 13 - 3 = , 10, 3, 10 + 3 = , 10, 13, 13 - 10 = , 3, 10.

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