9.请按以下顺序交换电车：
K-1, 1-2, J-K, K-1, 1-3, E-1, 1-K, K-J, B-1, 1-E, A-B, B-1, 1-K,
3-1, 1-B, B-A, C-B, B-1, 1-3, H-1, 1-B, I-H, H-1, B-C, 1-B, 3-1, 1-H, H-I. B-1, 1-3, C-B, B-1, 1-H, 3-1, 1-B, B-C, 2-1, 1-B,
K-1, 1-2, E-1, 1-3, F-E, E-1, 1-K, H-1, 1-E, E-F, D-E, E-1, 1-H, 2-1, 1-E, E-D, H-1, 1-2, G-H, H-1, 1-E, 2-1,
1-H, H-G, I-H, H-1, 1-2, K-1, 1-H.H-I, 3-1, 1-H, L-K, K-1, 1-3, 2-1, 1-K, K-L, J-K, K-1, 1-2, E-1, 1-K, K-J, 2-1, 1-K, F-E, E-1, 1-2, 3-1, 1-E, E-F, 2-1, 1-E.
