Correct: 1 + 1 = 2, 1 + 7 = 8, 3 - 1 = 2, 4 + 6 = 10, 6 - 4 = 2, Incorrect: 11 + 1 = 111, 1 + 15 = 15, 12 + 1 = 14, 34 + 1 = 355, 3 - 2 = 0,

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