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Omnicom Group CEO John Wren is pictured during a press conference... News PhotoCorporate Business,Finance,France,John Wren,Maurice Levy,Mergers and Acquisitions,Paris - France,Press Conference,VerticalPhotographer Collection: AFP 2013 AFPOmnicom Group CEO John Wren is pictured during a press conference with Publicis Group CEO Maurice Levy on July 28, 2013 in Paris. French advertising group Publicis and its US rival Omnicom will merge, bringing together the third and second largest firms in the sector to form the world's advertising leader, the two companies announced Sunday. AFP PHOTO BERTRAND LANGLOIS (Photo credit should read BERTRAND LANGLOIS/AFP/Getty Images)