edge { arrowstyle: filled; }
graph {
  colorscheme: x11;
  flow: south;
  title: G;
}

[ | A| ] { basename: node0; }
[ | B| ] { basename: node1; }
[ | C| ] { basename: node2; }

[ node0.0 ] --> [ node1.1 ]
[ node0.2 ] --> [ node2.2 ]
[ node1.0 ] --> [ node2.1 ]