st=>start: Start|past:>http://www.google.com[blank]
  e=>end: End|future:>http://www.google.com
  op1=>operation: My Operation|past
  op2=>operation: Stuff|current
  sub1=>subroutine: My Subroutine|invalid
  cond=>condition: Yes
  or No?|approved:>http://www.google.com
  c2=>condition: Good idea|rejected
  io=>inputoutput: catch something...|future
  st->op1(right)->cond
  cond(yes, right)->c2
  cond(no)->sub1(left)->op1
  c2(yes)->io->e
  c2(no)->op2->e