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#ifndef TREE_H_HG
#define TREE_H_HG
enum nodeType {
BIOP,
UNOP,
LTTR
};
typedef struct node {
enum nodeType type;
char el;
union {
struct node *child[2];
struct {
struct node *lhs, *rhs;
};
struct node *value;
};
} node;
node * parse(char *str);
void printTree(node *root, int level);
#endif
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