notes/school/di-ma/20181121_2-k23.dot

graph k23 {
    rankdir="LR";
    node [ shape="point" ];
    {
        rank="same";
        1;
        2;
    }
    {
        rank="same";
        3;
        4;
        5;
    }
    1 -- 3;
    1 -- 4;
    1 -- 5;
    2 -- 3;
    2 -- 4;
    2 -- 5;
}