main(a,b -> x,y) =
  alu    :: Alu2
  debug  :: Debug
  fifo1  :: Fifo
  fifo2  :: Fifo

  { 0, 1 } --> fifo1.in
  
  fifo1.out --> fifo1.in, fifo1.in
  fifo1.out --> fifo1.in, fifo1.in
  fifo1.out --> debug.in
  fifo1.out --> debug.in
  fifo1.out --> debug.in
  fifo1.out --> debug.in