:Repeat Statement

 
       |
       :Repeat
       |
       code
       |
       .---------------.
       |               |
       :End[Repeat]    :Until bexp
       |               |
       |               .-------.
       |               |       |
       |               |       andor
       |               |       |
       |               |<------'
       |               |
       |<--------------'
       |