[Haskell-cafe] Nice clean code example?

[Han Joosten]

I'd like to showoff some nice Haskell code to a CTO with no experience with
FP. I promised to send him a small piece of Haskell so he could get an
idea. The code should be easy to read, without obscure looking operators
(so sorry, no lens, arrows stuff like that), optionally even do something
interesting.
Who has the nicest example laying around?

(and yes, I need it by yesterday ;-)  )

Thanks!
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