Digraph G {
        graph [concentrate=true, ];
        subgraph cluster_A {
                "X";
        }
        subgraph cluster_B {
                "Y";
                "Z";
        }
        "X" -> "K" [weight=4.36794];
        "Z" -> "K" [weight=1.76549, label=" "];
        "Z" -> "Y"[weight=3.53098];
        "Y" -> "L"[weight=2.46349];
        "M" -> "L"[weight=2.71826];
        "M" -> "X";
}