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Programming doubly linked list storage structure and basic operation of the design methods, including the following features: initialize doubly linked list H (H is a single list head pointer) turn tail interpolation using insert ' a' , ' b' , ' c' , ' d' , ' e' character five elements doubly linked list H output output length of the doubly linked list H H determine whether the doubly linked list is empty double output H of the third element in the doubly linked list H output characters element ' d' position insert characters element in the fourth position on the element ' f' output doubly linked list doubly linked list H H delete the first three elements of the doubly linked list H output release and destroy doubly linked list H