digraph {
    node [ shape="circle" ];
    {
        rank=same;
        1;2;
    }
    {
        rank=same;
        3;5;
    }
    1 -> 5 -> 4 -> 3 -> 2 -> 1;
    1 -> 3;
    2 -> 4;
    3 -> 5;
    4 -> 1;
    5 -> 2;
}