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A comment on Blocking via an Unsolvable CAPTCHA. Parent comment

Re:Blocking via an Unsolvable CAPTCHA by lisper on Wednesday January 17, 2018 @03:30AM (#16166375)
No, it's a little more subtle than that. If you really want to know, the answer is in this paper:

http://www.flownet.com/ron/QM.pdf

Or if you prefer, this video:

https://www.youtube.com/watch?v=dEaecUuEqfc

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