已知东、西、南、北四个方向各有红黄绿色三个灯，在东西方向有两个数码管，在南北方向也有两个数码管。要求交通灯按照表1进行显示和定时切换，并要求在数码管上分别倒计时显示东西、南北方向各状态的剩余时间-Known in the east, west, south and north four directions each have three red green and yellow lights, in what direction have two digital tube, also have two digital tube in the north-south direction. Require traffic lights according to table 1 for display and timing switch, and require separately the countdown in the digital tube display items, each of the remaining time of north and south direction