+1 on Control.Monad.Omega. In point of fact, your diagN function is simply
diagN = runOmega . mapM Omega You'll find it an interesting exercise to grok the source of Control.Monad.Omega, obviously, but essentially, you're replacing concatMap with a fair (diagonal) traversal order version. Louis Wasserman wasserman.lo...@gmail.com http://profiles.google.com/wasserman.louis
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