Removing nodes from a dll

(dll-delete dll node)

Delete node from the doubly linked list dll. Return the element of node.

(dll-delete-first dll)

Delete the first node from the doubly linked list dll. Return the element. Returns nil if dll was empty.

(dll-delete-last dll)

Delete the last node from the doubly linked list dll. Return the element. Returns nil if dll was empty.

(dll-clear dll)

Clear the doubly linked list dll, i.e. make it completely empty.

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