What name was attached to Germany's World War II submarines?

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Which racing team introduced a six-wheeled race car in 1974 and began racing it in 1976?

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In the "Popeye" comics, on what day would Wimpy gladly pay you for a hamburger?

On which island is the Empire State Building located?

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What did the Emancipation Proclamation do?

What is the smallest country by area and population?