[Haskell-beginners] How to unnest "do"

[Emmanuel Touzery]

>     stats :: String -> String
>     stats =
>         unwords .
>         sequence [show . length . words,
>                   show . length . lines,
>                   show . length]
>
>
[..]


> This improves the statistics code slightly, but uses some monadic
> machinery you may not be familiar with.  Another way to read the 'stats'
> function is this:
>
>     stats :: String -> String
>     stats str =
>         unwords [show . length . words $ str,
>                  show . length . lines $ str,
>                  show . length $ str]
>


I'm sorry, may I ask on which monad here is "sequence" operating?

I can see that sequence here turns [a->a] into a->[a], I'm just not sure
which is the monad at play here... I just need a little bit more
explanation about this code before I get it.

Thank you!

Emmanuel
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