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Associated Press
This undated publicity image released by CBS shows, from left, Simon Helberg, Jim Parsons, and Johnny Galecki in a scene from "The Big Bang Theory." For the 10th time in 11 years, CBS was the nation's most-watched network, the Nielsen company said Thursday, May 23, 2013. TV's top comedy is "The Big Bang Theory" on CBS, averaging 15.6 million viewers per week.  (AP Photo/CBS, Michael Yarish, File)

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