Entering elements in a dll

(dll-enter-first dll element)

Add an element first on a doubly linked list.

(dll-enter-last dll element)

Add an element last on a doubly linked list.

(dll-enter-after dll node element)

In the doubly linked list dll, insert a node containing element after node.

(dll-enter-before dll node element)

In the doubly linked list dll, insert a node containing element before node.

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