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by coolsunglasses 4767 days ago

http://en.wikipedia.org/wiki/Koan

http://en.wikipedia.org/wiki/Hacker_koan

http://www.catb.org/~esr/writings/unix-koans/

http://catb.org/jargon/html/koans.html

http://c2.com/cgi/wiki?TestDrivenDevelopment

http://rubykoans.com/

https://github.com/google/lisp-koans/blob/master/README