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typedef struct TreeNode *SearchTree;
typedef struct TreeNode *Position;
struct TreeNode{
ElementType Element;
SearchTree Left;
SearchTree Right;
};
SearchTree MakeEmpty(SearchTree T){
if(T != NULL){
MakeEmpty(T->Left);
MakeEmpty(T->Right);
free(T);
}
return NULL;
}
main(){
SearchTree stree;
stree = MakeEmpty(stree);
}