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**FILE** Sens. Carl Levin (left), Michigan Democrat and Chairman for the Senate Homeland Security and Governmental Affairs Permanent subcommittee on Investigations, and John McCain of Arizona, the subcommittee's ranking Republican, arrive on Capitol Hill in Washington on May 21, 2013, for the subcommittee's hearing to examine the methods employed by multinational corporations to shift profits offshore and how such activities are affected by the Internal Revenue Code. (Associated Press)

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