flowchart LR
  Start[Start]
  Stop[Stop]
  Start --> Mant([<a href="#Digits">Digits</a>])
  Mant --> Dot([<tt>.</tt>])
  Dot --> Frac([<a href="#Digits">Digits</a>])
  Frac --> Stop
  Frac --> E([<tt>E</tt> / <tt>e</tt>])
  Mant --> E
  E --> Sign([<tt>+</tt> / <tt>-</tt>])
  E --> Exp([<a href="#Digits">Digits</a>])
  Sign --> Exp
  Exp --> Stop
  Mant --> Stop

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