notes/school/di-ma/20181121_2-k5.dot

graph k5 {
    splines=false;
    node [ shape="point" ];
    {
        rank="same";
        2;
        6 [ style="invis" ];
        3;
    }
    {
        rank="same";
        4
        5;
    }

    1 -- 2 -- 4;
    1 -- 3 -- 5;
    1 -- 4;
    1 -- 5;
    2 -- 6;
    6 -- 3;
    4 -- 5;
    2 -- 5;
    3 -- 4;

}