Motor train seat distribution map

The second-class seats of bullet trains are arranged in a "3+2" way. Each row of seats generally has "3+2" five seats, and the five letters "A, B, C, D and F" are used to indicate the number of seats in turn. There is an aisle between Block C and Block D. A and F are window seats, while abc three seats are close together, and D and F are two seats. The distribution map of motor train seats is as follows:

The reason why there is no E seat in the bullet train has a lot to do with the naming of seats in the plane. In the past, many planes were single-aisle. There are generally six seats in each row. The seats are named in turn by the letters A, B, C, D, E and F. Seats A and F are near the window, and there is an aisle between seats C and D. Gradually, A and F, C and D are no longer just numbers representing seats, but seats near the window and aisle.

Because bullet trains use the naming rules of airplane seats, the number of second-class seats in each row of bullet trains is only five, which is less than that of airplanes 1, and A and F, C and D have been habitually expressed, so we can only remove E and directly receive F from D, and arrange them in alphabetical order of A, B, C, D and F.

Because there are only four seats in the first-class seat of the bullet train, each row is only 1 seat less than the second-class seat, so when naming the first-class seat, only B sandwiched between A and C can be removed and arranged in acdf order. Whether it's first class or second class, A and F stand for window seats, and C and D stand for aisle seats.