[Haskell-beginners] More direct binding of IO result

[Arlen Cuss]

>     fmap putStrLn :: IO String -> IO (IO ())

Ah, thanks! Should've thought more clearly about the types involved
here!

>     join :: IO (IO a) -> IO a

Super-handy to know :D I also note that `concat' is simply `join' in the
list monad!

> Michael

Arlen
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