. Write a program to implement the order table of all kinds of basic operation, and on this basis to design a main program to complete the following functions:
(1) the initialization sequence table L;
(2), in turn, by the methods of tail plug or head into a, b, c, d, e;
(3) the output sequence table L;
(4) the length of the output sequence table L;
(5) in the third element position insert element f;
(6) the output sequence table L;
(7) to delete the order table L fourth element;
(8) the output sequence table L;