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Associated Press
Senate Homeland Security and Governmental Affairs Permanent subcommittee on Investigations Chairman Sen. Carl Levin, D-Mich., holds up his own Apple iPhone, on Capitol Hill in Washington, Tuesday, May 21, 2013, as he presses Apple CEO Tim Cook, left, for answers about how Apple, the world's most valuable company, and based in Cupertino, Calif., diverts a billion dollars to an Irish subsidiary as a tax strategy, according to a report issued this week by the subcommittee.  (AP Photo/J. Scott Applewhite)

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