digraph {
  overlap=scale
  rankdir=LR
  node [shape=record, style=rounded, fontname="Sans Bold"]
  edge [fontname="Sans"]
  subgraph cluster_M {
    label=<M<BR ALIGN="LEFT"/>>
    shape=record
    style=rounded
    fontname="Sans Bold Italic"
    INITIAL [label="", shape=circle, width=0.2, style=filled, fillcolor=black]
    S [label=<<B>S</B>>]
    T [label=<<B>T</B>>]
    INITIAL -> S
    "S" -> "T" [label=<<FONT FACE="Sans Italic">A</FONT>>]
  }
}