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Buick Riviera Concept 2013 model is unveiled ahead of the Shanghai International Automobile Industry Exhibition (AUTO Shanghai) in Shanghai, China Friday, April 19, 2013. (AP Photo/Eugene Hoshiko)

Associated Press
Buick Riviera Concept 2013 model is unveiled ahead of the Shanghai International Automobile Industry Exhibition (AUTO Shanghai) in Shanghai, China Friday, April 19, 2013. (AP Photo/Eugene Hoshiko)
Buick Riviera Concept 2013 model is unveiled ahead of the Shanghai International Automobile Industry Exhibition (AUTO Shanghai) in Shanghai, China Friday, April 19, 2013. (AP Photo/Eugene Hoshiko)
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