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#ifndef _H_GRAPHS
#define _H_GRAPHS
#include "syntax.h"
struct node {
expr_kind kind;
void* var1;
void* var2;
unsigned int used_count;
};
typedef struct {
unsigned int length;
struct node* nodes[1];
} nodes_array;
void use_node(struct node* node, unsigned int count);
void free_node(struct node* node, unsigned free_first);
nodes_array* push_node(nodes_array* nodes, struct node* node);
void cpy_expression_to_node(struct node* dst, expression* src);
void cpy_node_to_expression(expression* dst, struct node* src);
#endif
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