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ppod
on July 12, 2011
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How not to design a CAPTCHA
A system to solve problems like #1 was actually one of the very first tasks solved by early AI research. It was a PhD in MIT in 1964.
http://en.wikipedia.org/wiki/STUDENT_%28computer_program%29
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Search:
http://en.wikipedia.org/wiki/STUDENT_%28computer_program%29