8 void change_split_ratio(Node *, value_change_t);
9 Node *first_extrema(Node *);
10 Node *second_extrema(Node *);
11 Node *find_fence(Node *, direction_t);
12 Node *find_neighbor(Node *, direction_t);
13 void move_fence(Node *, direction_t, fence_move_t);
14 void rotate_tree(Node *, rotate_t);
15 void dump_tree(Node *, char *, int);