digraph Trie {
   
   // normal nodes
   node [
     shape = circle
     width = 0.65
     fixedsize = true
   ]; "" J Ja Jav R Ra Ran Ro Ros;
   
   // full word nodes
   node [
     shape = doublecircle
   ]; Java Rad Rand Rau Raum Rose;   
  
   "" -> J [ label = " J" ];
   "" -> R [ label = " R" ];

   J -> Ja [ label = " a" ];
   Ja -> Jav [ label = "v"];   
   Jav -> Java [ label = " a"];

   R -> Ra [ label = "  a" ];   

   Ra -> Rad [ label = " d" ];

   Ra -> Ran [ label = "  n" ];
   Ran -> Rand [ label = "  d" ];

   Ra -> Rau [ label = "  u" ];
   Rau -> Raum [ label = "  m" ];

   R -> Ro [ label = " o" ];
   Ro -> Ros [ label = "  s" ];
   Ros -> Rose [ label = "   e" ];

   // invisible nodes for alignment (recommended by FAQ)
   node [
     label = "."
     width = .6
     style = invis
   ]; 
 
   edge [
     style = invis
   ]

   Ja -> Rad;
   Rad -> Java;

   "" -> foo;
   R -> foo;
   J -> foo;
 }