digraph G {
            0 -> 6;
            1 -> 6;
            2 -> 0;
            3 -> 5;
            3 -> 8;
            4 -> 1;
            5 -> 2;
            5 -> 4;
            5 -> 7;
            7 -> 0;
            7 -> 6;
            8 -> 6;
            8 -> 7;
        }