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Mercedes driver Lewis Hamilton, of Britain, flashes number four as he celebrates with his teammates at the pit lane after the Formula One Mexico Grand Prix auto race at the Hermanos Rodriguez racetrack in Mexico City, Sunday, Oct. 29, 2017. Hamilton won his fourth career Formula One season championship on Sunday with a ninth-place finish at the Mexican Grand Prix in a race won by Red Bull's Max Verstappen. (AP Photo/Rebecca Blackwell)