[Haskell-cafe] river crossing puzzle

Hi, Does anyone know where there are any Haskell implementations of the the River Crossing puzzle (AKA Farmer/Fox/Goose/Grain). There are several variations but the general ideas are explained at: http://en.wikipedia.org/wiki/River_crossing_puzzle http://en.wikipedia.org/wiki/Fox,_goose_and_bag_of_beans_puzzle I have found one at: http://www.shido.info/hs/haskell9.html Thanks, Pat