doc/figs/example-shift.gv

digraph "shift.y"
{
  node [fontname=courier shape=box]
  edge [fontname=courier]

  3 [label="State 3\n  1 exp: a . \".\"\l"]
  3 -> 6 [style=solid label="\".\""]
  6 [label="State 6\n  1 exp: a \".\" .\l"]
}