14 struct toptree {  struct
18 	struct toptree *parent;  argument
23 struct toptree *toptree_alloc(int level, int id);  argument
24 void toptree_free(struct toptree *cand);
25 void toptree_update_mask(struct toptree *cand);
26 void toptree_unify(struct toptree *cand);
27 struct toptree *toptree_get_child(struct toptree *cand, int id);
28 void toptree_move(struct toptree *cand, struct toptree *target);
29 int toptree_count(struct toptree *context, int level);
31 struct toptree *toptree_first(struct toptree *context, int level);
32 struct toptree *toptree_next(struct toptree *cur, struct toptree *context,