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An Open Letter to the US Department of Justice Regarding Search Advertising 

4A's President and CEO Nancy Hill, along with the heads of the four major advertising holding companies--Maurice Levy, Chairman and CEO, Publicis Groupe; Martin Sorrell, CEO, WPP; Michael I. Roth, Chairman and CEO, Interpublic Group of Companies; and John Wren, President and CEO, Omnicom Group--address the impending integration of Microsoft and Yahoo! search technologies.

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