12, 16 - 4 =, 10, 20 - 10 =, 5, 12 - 7 =, 9, 13 - 4 =, 1, 3 - 2 =, 2, 2 - 0 =, 3, 9 - 6 =, 13, 18 - 5 =, 6, 8 - 2 =, 16, 17 - 1 =

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