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U.S. Secretary of State John Kerry, centre, meets with Iranian Foreign Minister Mohammad Javad Zarif in Vienna, Austria, Friday July 3, 2015.  Iran has committed to implementing the IAEA's "additional protocol" for inspections and monitoring as part of an accord, but the rules don't guarantee international monitors can enter any facility including sensitive military sites, so making it difficult to investigate allegations of secret work on nuclear weapons. (Carlos Barria/Pool via AP)

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