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"
    ]

    "py (4)" [fillcolor="deepskyblue2"];
    "scala (4)" [fillcolor="deepskyblue2"];
    "java (4)" [fillcolor="deepskyblue2"];
    "ipynb (1)" [fillcolor="deepskyblue2"];
    "xml (1)" [fillcolor="deepskyblue2"];
    "yml (1)" [fillcolor="deepskyblue2"];



    "java (4)" -- "scala (4)" [label=" 4 ", penwidth="4", color="#00688b93"];
    "py (4)" -- "java (4)" [label=" 3 ", penwidth="3", color="#00688b82"];
    "py (4)" -- "scala (4)" [label=" 3 ", penwidth="3", color="#00688b82"];
    "java (4)" -- "xml (1)" [label=" 1 ", penwidth="1", color="#00688b5E"];
    "scala (4)" -- "xml (1)" [label=" 1 ", penwidth="1", color="#00688b5E"];
    "py (4)" -- "ipynb (1)" [label=" 1 ", penwidth="1", color="#00688b5E"];
    "java (4)" -- "ipynb (1)" [label=" 1 ", penwidth="1", color="#00688b5E"];
    "scala (4)" -- "ipynb (1)" [label=" 1 ", penwidth="1", color="#00688b5E"];

}