Correct: 5 + 5, 6 + 4, 3 +7, 2 + 8, 1 + 9, 4 + 6, 7 + 3, 8 + 2, 9 + 1, Incorrect: 5 + 4, 3 + 6, 2 + 7, 3 + 5, 4 + 4, 6 + 2, 7 + 1, 3 + 4, 9 + 0,

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