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#include <gvc.h>
int main(int argc, char **argv)
{
GVC_t *gvc;
graph_t *g;
FILE *fp;
gvc = gvContext();
if (argc > 1)
fp = fopen(argv[1], "r");
else
fp = stdin;
g = agread(fp);
gvLayout(gvc, g, "dot");
gvRender(gvc, g, "plain", stdout);
gvFreeLayout(gvc, g);
agclose(g);
return (gvFreeContext(gvc));
}