digraph EXAMPLE
{
  node [shape = oval];
  ranksep = 0.6;


  pippo [label="Pippo"];
  pluto [label="Pluto"];
  topolino [label="Topolino", shape="rect"];
  orazio [label="Orazio"];
  

  pippo -> pluto -> orazio;
  pippo -> topolino -> orazio;
  pippo -> orazio		[color="blue", penwidth="2"];
}