digraph Stemma {
    omega [ class=hypothetical ];
    T1 [ class=extant ];
    T2 [ class=extant ];
    A [ class=extant ];
    B [ class=extant ];
    C [ class=extant ];
    D [ class=extant ];
    F [ class=extant ];
    J [ class=extant ];
    L [ class=extant ];
    M [ class=extant ];
    S [ class=extant ];
    U [ class=extant ];
    V [ class=extant ];
    T1 -> T2;
    T2 -> A;
    A -> J;
    A -> C;
    C -> M;
    C -> F;
    C -> S;
    S -> D;
    A -> U;
    U -> F;
    U -> V;
    U -> omega;
    omega -> B;
    B -> L;
}