[1, 2, 3, 4, 5, 6, 7, 8, 9, 10] [1, 3, 2, 4, 5, 6, 7, 8, 9, 10] [1, 3, 2, 4, 5, 6, 7, 8, 9, 10] 1 3 2 4 5 8 7 6 9 10