after 3, 4, 5, before 10, 6, 9, after 5, 4, 6, before 9, 8, 5, after 13, 14, 2, before 4, 8, 3, after 11, 12, 3, before 8, 5, 7, after 16, 12, 17, before 7, 9, 6, before 20, 10, 19.

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