What sport has thirteen players per team in "league" rules but fifteen in "union" play?

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Who's responsible for "The Ballad of Bilbo Baggins"?

In what Missouri town did Mark Twain grow up?

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What does the equation E=mc2 represent?

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What basketball player starred alongside Jean Claude Van Damme in the movie "Double Team"?

Which towering professional wrestler passed away on January 27, 1993?

Sir Edmund Hillary and Tenzing Norgay were the first people to do what?