digraph G {
    compound="true"
    rankdir="TB"
    bgcolor="white"
    node [
        fixedsize="false"
        fontname="Tahoma"
        color="white"
        fillcolor="grey"
        fontcolor="black"
        shape="box"
        style="filled"
        penwidth="1.0"
    ]
    edge [
        fontname="Arial"
        color="deepskyblue4"
        fontcolor="black"
        fontsize="12"
        arrowsize="0.5"
        penwidth="1.0"
    ]

    "examples" [fillcolor="deepskyblue2"];
    "src/apps" [fillcolor="deepskyblue2"];
    "src/h3lib" [fillcolor="deepskyblue2"];

    "src/apps" -> "src/h3lib" [label=" 3 ", penwidth="3"];

}