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The 2014 Chevrolet Silverado debuts in Pontiac, Mich., Thursday, Dec. 13, 2012. The models roll into a market where truck sales are growing after a five-year slump. (AP Photo/Paul Sancya)

Associated Press
The 2014 Chevrolet Silverado debuts in Pontiac, Mich., Thursday, Dec. 13, 2012. The models roll into a market where truck sales are growing after a five-year slump. (AP Photo/Paul Sancya)
The 2014 Chevrolet Silverado debuts in Pontiac, Mich., Thursday, Dec. 13, 2012. The models roll into a market where truck sales are growing after a five-year slump. (AP Photo/Paul Sancya)
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