digraph {
    XN [label="",shape="point"]
    YN [label="",shape="point"]
    WL [label="",shape="point",width="0"]
    e [label="",shape="point",width="0"]
    WN [label="",shape="point"]
    XN -> WL [constraint="false",arrowhead="none"]
    WL -> YN [constraint="false"]
    YN -> Y [style="dotted"]
    XN -> X [style="dotted"]
    WN -> W [style="dotted"]
    WL -> e [constraint="true",arrowhead="none"]
    e -> WN [constraint="true"]
}