True: 8 + 2 = 10, 10 - 1 = 9, 4 + 4 = 8, 20 - 7 = 13, 2 + 3 = 5, False: 20 - 10 = 6, 8 - 6 = 1, 2 + 4 = 5, 3 - 3 = 1, 7 + 3 = 4,

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