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Mahmoud Ahmadinejad speaks during a ceremony at the Natanz nuclear enrichment facility in this April 9, 2007 file photo (Credit: Reuters/Caren Firouz/Files)

Mahmoud Ahmadinejad speaks during a ceremony at the Natanz nuclear enrichment facility in this April 9, 2007 file photo (Credit: Reuters/Caren Firouz/Files)