Correct: 10-4 = 6, 7-3 = 4, 10-5 = 5, 20-0 = 20 , 14-7 = 7, 12-6 = 6, 18-9 = 9, 8-4 = 4, 5-3 = 2, Incorrect: 10-5 = 2, 7-7 = 7, 6-3 = 9, 12-6 = 10, 5-0 = 4, 9-5 = 6,

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