[Haskell-cafe] Programming with arrows, exercises

[Sergey Mironov]

Hello. I am reading "Programming with Arrows" by John Hughes (very
helpful and interesting!), the book has an exercises requiring a
module called Circuits for checking the answer. There should be things
like class ArrowCircuit and various functions related to digital logic
circuits simulation.  Does anybody know where can I find one?

Thanks,
Sergey