graph G {
    compound="true"
    rankdir="TB"
    bgcolor="white"
    fontname="Tahoma"

    node [
        fixedsize="false"
        fontname="Tahoma"
        color="white"
        fillcolor="deepskyblue2"
        fontcolor="black"
        shape="box"
        style="filled"
        penwidth="1.0"
    ]
    edge [
        fontname="Arial"
        color="#00688b"
        fontcolor="black"
        fontsize="12"
        arrowsize="0.5"
        penwidth="1.0"
    ]




    "be" -- "be" [label=" 31 ", penwidth="10", color="#a0a0a0FF"];
    "fe" -- "fe" [label=" 20 ", penwidth="6", color="#a0a0a0B7"];
    "fe" -- "be" [label=" 9 ", penwidth="2", color="#00688b70"];
    "common" -- "fe" [label=" 5 ", penwidth="1", color="#00688b5E"];
    "common" -- "be" [label=" 3 ", penwidth="1", color="#00688b4C"];
    "shell" -- "shell" [label=" 2 ", penwidth="1", color="#a0a0a04C"];
    "common" -- "common" [label=" 1 ", penwidth="1", color="#a0a0a04C"];

}