6, 9 - 3 =, 7, 14 - 7 =, 5, 13 - 8 =, 4, 20 - 16 =, 8, 14 - 6 =, 0, 16 - 16 =, 10, 19 - 9 =, 30, 60 - 30 =, 20, 40 - 20 =, 40, 70 - 30 =

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