graph {
    node [ shape="point" ];
    0 [ label="" ];
    1 [ label="" ];
    2 [ label="" ];
    3 [ label="" ];
    4 [ label="" ];
    5 [ label="" ];
    6 [ label="" ];
    7 [ label="" ];

    0 -- 1;
    0 -- 2 -- 3;
    3 -- 4;
    3 -- 5 -- 6 -- 7;
}