cat_set
struct cat_set *setp;
struct cat_set *first_set; /* the pointer to the first set */
struct cat_set *current_set; /* the pointer to the current set */
struct cat_set *
struct cat_set *p;
p = (struct cat_set *) MALLOC(sizeof (struct cat_set));
struct cat_set *prev, *next;
struct cat_set *prev, *next, *setp;
struct cat_set *p = current_set;
struct cat_set *prev;
struct cat_set *next;