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

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