layer4.dot

digraph D {
    node [pin=true, width=2, height=1, shape=record, fixedsize=true, autosize=false, fontname="Arial"];
    subgraph cluster_0 {
      e [label="Go to Notification"];
      d [label="Go to Barracks"];
      c [label="Go to Stable"];
      b [label="Go to Archery"];
      a [label="Go to\nSiege Workshop"];
    }
    subgraph cluster_1 {
      j [label="Go to Castle"];
      i [label="Go to Market"];
      h [label="Go to Blacksmith"];
      g [label="Go to Monastery"];
      f [label="Go to Mill"];
    }

    subgraph cluster_2 {
      k [label="Go to Dock"];
      l [label="Garrison Units"];
      m [label="Ungarrison Units"];
      n [label="Set Gather Point"];
      o [label="(free)"];
    }
  a -> f [style=invis];
  j -> k [style=invis];
}