1 + 1 , 2, 3, 2 + 2 , 5, 4, 3 + 3 , 8, 6, 4 + 4 , 8, 6, 5 + 5 , 10 , 11, 6 + 6 , 14, 12, 7 + 7 , 14, 16, 8 + 8, 19, 16, 9 + 9 , 18, 10, 10 + 10 , 22, 20.

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