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Belgian Tom Boonen storming to the finish of the 2012 Paris Roubaix professional cycling race classic - for the fourth time. Here, Boonen is passing Gruson, the 3rd last section of cobbles, 243km into the 256.5km route from Compiègne, near Paris, to Roubaix, northern France, crossing 51.5km of pavé - ancient cobblestones, along the way.