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What are the six largest media groups in the world?

NO.1 Omnicom Group (New York), Chinese name: Omnicom Group

NO.2 WPP Group (London), abbreviation: WPP

NO. 3 Interpublic Group (New York), referred to as: IPG

NO.4 Publicis Groupe (Paris), Chinese name: Publicis Groupe

NO.5 Dentsu Dentsu (Tokyo), Chinese Name: Dentsu

NO.6 Havas (France)