True: 6 - 2 = 4, 8 - 5 = 3, 7 - 3 = 4, 15 - 9 = 6, 18 - 11 = 7, 20 - 12 = 8, 13 - 13 = 0, False: 3 - 1 = 3, 5 - 4 = 6, 10 - 10 = 20, 14 - 4 = 0, 16 - 7 = 11, 19 - 2 = 18, 0 - 0 = 10,

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