struct ListNode
{
    struct ListNode *next;      //next node in list
    struct ListNode *previous;  //previous node in list
    char *data;                 //a pointer to allocated space containing a word
};

struct List
{
    struct ListNode *head;      //start of list
    struct ListNode *tail;      //end of list
};


void AddWord(struct List *l, char *w);

void PrintList(struct List *l);

void DeleteList(struct List *l);