flowchart LR
  Start[Start]
  Stop[Stop]
  Start --> Exit([<tt>Exit</tt>])
  Exit --> Stop
  Exit --> Open([<tt>#40;</tt>])
    --> Expr([<a href="Expression">Expression</a>])
    --> Close([<tt>#41;</tt>])
    --> Stop

  style Start fill:#44E
  style Stop fill:#E44