One of the things I remember from my days at AMD is Joel Holder telling me that Captcha (Completely Automated Public Turing test to tell Computers and Humans Apart) implementations with two words really only check for validation against one word no different from the usual Captcha implementations. The second word is a word that is being translated from a scan from a book and by making parties bottleneck through a Captcha and retype text anyways, a means emerges for translating books via crowdsourcing. Perhaps a participant will mistype a word to translate, but not any one word will be submitted to more than one participant.
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