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Associated Press
Red Bull team principal Christian Horner, is seen prior to the hearing at the FIA headquarters in Paris, Thursday, June 20, 2013. The hearing to determine whether Mercedes and Pirelli broke Formula One rules by holding in-season tire tests has opened in Paris. The International Automobile Federation (FIA) convened the international tribunal hearing to determine whether Mercedes gained a competitive advantage from the testing session in Barcelona last month. (AP Photo/Michel Euler, Pool)

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