I've always found that with Haskell, if I can get my program to compile without error, it usually runs flawlessly. (Except for the occasional off-by-one error. :-)
Then you need "Scott and Dave's Programming Language" -- SAD/PL. By providing separate data types for even and odd numbers, you can avoid off-by-one errors ;-)
--Tongue-in-cheek-ily-yours, Scott David Daniels [EMAIL PROTECTED]
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