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extern Agraph_t *openG(char *name, Agdesc_t);
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extern Agraph_t *openSubg(Agraph_t * g, char *name);
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extern Agnode_t *openNode(Agraph_t * g, char *name);
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extern Agedge_t *openEdge(Agraph_t* g, Agnode_t * t, Agnode_t * h, char *key);