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Associated Press
FILE- In this Thursday, June 6, 2013 file photo, a Mercedes mechanic holds a tire in the pit, at the Gilles Villeneuve racetrack, in Montreal, Canada. A tire testing session involving Mercedes and Pirelli that was criticized by rival Formula One teams will be referred to the FIA's international tribunal as a possible breach of the sport's rules. (AP Photo/Luca Bruno, file)

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