digraph {
    a [ label="A", xlabel="2" ];
    b [ label="B", xlabel="1" ];
    c [ label="C", xlabel="3" ];
    d [ label="D", xlabel="4" ];
    e [ label="E", xlabel="5" ];

    a -> d;
    a -> c;
    b -> a;
    b -> c;
    c -> e;
    d -> e;
}