2 x 1, 2, 0, 2 x 2, 3, 4, 2 x 3, 6, 7, 2 x 4, 5, 8, 2 x 5, 10, 4, 2 x 6, 13, 12, 2 x 7, 14, 12, 2 x 8, 16, 13, 2 x 9, 11, 18, 2 x 10, 20, 17

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