Rule TripletLoop
  input '1'
  output '3'
Flow
  rule TripleC
  rule TripleB
  rule TripleA
End

Rule TripleC
  input '3'
  output '1'
End

Rule TripleB
  input '2'
  output '3'
End

Rule TripleA
  input '1'
  output '2'
End