digraph mygraph { 
node [shape=box];
start -> x100 -> x0118;
        x100 -> x010f -> x0126;
                x010f -> x0118 -> x0120; x0120 -> x0181[label="call"];
                x0181 -> x0185; x0185 -> x0123[label="ret"]
x0120[label="call"];
}