Given set: 337, 724, 652
3 + 3 + 7 = 13 → 1 + 3 = 4 7 + 2 + 4 = 13 → 1 + 3 = 4 6 + 5 + 2 = 13 → 1 + 3 = 4 5 + 3 + 5 = 13 → 1 + 3 = 4
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