digraph Stemma {
1 [ class="hypothetical" ];
2 [ class="hypothetical" ];
A [ class="extant" ];
B [ class="extant" ];
C [ class="extant" ];
1 -> A;
1 -> 2;
2 -> B;
2 -> C;
}
digraph Stemma {
1 [ class="hypothetical" ];
2 [ class="hypothetical" ];
A [ class="extant" ];
B [ class="extant" ];
C [ class="extant" ];
1 -> A;
1 -> 2;
2 -> B;
2 -> C;
}