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1.___________________________(1941-2010) was best known for his work at Bletchley Park during World War II, helping to break the German Enigma code that was used to encrypt messages during WWII
2. In the ______________________________ called "________________________________________," the computer has to pass for a human after answering questions right more than 30% of the time during a 5-minute conversation.
3. A _________________________________ is used to determine if the computer is a person or a computer
4. A ______________________ is used to determine if the user is a human by typing in letters or selecting objects in a picture.

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