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On Apr 8, 2009, at 6:45 PM, Roberto Ierusalimschy wrote:

How challenging should be the challenges?

Looking at Ruby Quiz's archive, anything from English Numerals [1] to NDiff [2].

So... not too challenging... at least not in the academic sense of the term... no need to turn this into a spinoff of the Millennium Prize Problems... :D

[1] http://rubyquiz.com/quiz25.html
[2] http://rubyquiz.com/quiz46.html