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#ifndef _BINARY_SEARCH_TREE_H
#define _BINARY_SEARCH_TREE_H
struct TreeNode;
typedef struct TreeNode *Position;
typedef struct TreeNode *SearchTree;
typedef int elem_t;
SearchTree make_empty(SearchTree t);
Position find(elem_t x, SearchTree t);
Position find_min(SearchTree t);
Position find_max(SearchTree t);
SearchTree insert(elem_t x, SearchTree t);
SearchTree delete(elem_t x, SearchTree t);
elem_t retrieve(Position p);
#endif /* _BINARY_SEARCH_TREE_H */
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