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Associated Press
In this Tuesday, April 23, 2013 photo, University of Pennsylvania linguistics professor Bill Labov takes part in demonstration highlighting his work, at the Franklin Institute in Philadelphia. Labov says the Southern-inflected sound of the Philadelphia dialect is moving toward a more Northern accent. Some of Philly's trademark twangy, elongated vowel sounds are becoming less so, though others are getting stronger.  (AP Photo/Matt Rourke)

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