[Haskell] [newbie]any nice code to read?

[=?GB2312?B?1MbR7g==?=]

hello,all,
   I am new to haskell,and have read some tutorial, but I would like to read
some "real" code from "real" haskell project, I believe this will help me
study and use haskell quickly.
  would anyone please give me some suggestion about opensource project that
a new haskell user should study?
  thanks you.
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