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Correct

For instance, 2 + 5 + 9 +14 = 7 + 9 + 14 = 16 + 14 = 30

(2 + 5) + (9 + 14) = 7 + 23 = 30

2 + (5 + 9) + 14 = 2 + 14 +14 = 16 + 14 = 30

2 + (5 + (9 + 14)) = 2 + (5 + 23) = 2 + 28 = 30

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