You know those annoying 'prove you're not a robot' tests that you have to take on websites sometimes? They're known as CAPTCHAs. And CAPTCHA is actually an acronym standing for 'Completely Automated Public ______ test to tell Computers and Humans Apart.' What surname fills in the blank?

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1. You know those annoying 'prove you're not a robot' tests that you have to take on websites sometimes? They're known as CAPTCHAs. And CAPTCHA is actually an acronym standing for 'Completely Automated Public ______ test to tell Computers and Humans Apart.' What surname fills in the blank?