t/data/simple.dot

   1 digraph Stemma {
   2         1 [ class="hypothetical" ];
   3         2 [ class="hypothetical" ];
   4         A [ class="extant" ];
   5         B [ class="extant" ];
   6         C [ class="extant" ];
   7         1 -> A;
   8         1 -> 2;
   9         2 -> B;
  10         2 -> C;
  11 }