etnbrd/flx-compiler

digraph G {

  graph [ fontname="HelveticaNeue-Thin", fontcolor=black, fontsize=20 ];
  node [ fontname="HelveticaNeue-Thin", fontcolor=black, fontsize=20, penwidth=0.5 shape=circle, fixedsize=true, width=1.2, height=1.2 ];
  edge [ fontname="HelveticaNeue-Thin", fontcolor=black, fontsize=20, penwidth=0.5 splines=line, arrowsize=0.7 ];

  plus [label="+"]

  a -> plus;
  b -> plus;
  plus -> return;
  return -> c;
  4 -> a;
  5 -> b;
}