Correct: 6 + 7 = 13, 5 + 8 = 13, 3 + 9 = 12, 9 + 9 = 18, 4 + 7 = 11, 7 + 5 = 12, 9 + 4 = 13, 2 + 8 = 10, 4 + 9 = 13, 6 + 4 = 10, Incorrect: 6 + 7 = 14, 5 + 8 = 14, 8 + 8 = 12, 2 + 9 = 15, 5 + 6 =13, 1 + 6 = 8, 9 + 3 = 13, 4 + 6 = 12, 9 + 5 = 15, 8 + 5 = 11,

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