• Inaccessibility of Visually-Oriented Anti-Robot Tests
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• KittenAuth Test
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• Markov chain - Wikipedia, the free encyclopedia
  Markov processes can also be used to generate superficially "real-looking" text given a sample document: they are used in a variety of recreational "parody generator" software. These processes are also used by spammers to inject real-looking hidden paragraphs into unsolicited email in an attempt to get these messages past spam filters.
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