Corect: 9 + 2, 8 + 3, 7 + 4, 6 + 5, 5 + 6, 4 + 7, 3 + 8, Incorect: 9 + 7, 8 + 8, 7 + 6, 6 + 2, 5 + 5, 4 + 6, 9 + 9,

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