notes/school/di-ma/20181121_2-k33.dot

graph k33 {
    rankdir="LR";
    node [ shape="point" ];
    {
        rank="same";
        1;
        2;
        3;
    }
    {
        rank="same";
        4;
        5;
        6;
    }
    1 -- 4;
    1 -- 5;
    1 -- 6;
    2 -- 4;
    2 -- 5;
    2 -- 6;
    3 -- 4;
    3 -- 5;
    3 -- 6;
}