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typedef struct node_t {	struct node_t *next;	struct node_t *prev;	void *data;} NODE;typedef struct list_t {	NODE *head;	NODE *tail;	int size;} LIST;NODE *NodeNew(void *data);LIST *ListNew(void);void AddFirst(LIST *list, void *data);void AddLast(LIST *list, void *data);void *RemoveFirst(LIST *list);void *RemoveLast(LIST *list);int ListSize();