True: 5 + 6 = 11, 10 - 9 = 1, 10 + 5 = 15, 7 + 2 = 9, 6 - 4 = 2, False: 7 + 4 = 12, 5 - 0 = 0, 10 + 3 = 31, 5 + 4 = 10, 9 - 3 = 5,

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