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An Iranian student holds a picture of Supreme Leader Ayatollah Ali Khamenei (L) and Iran’s Late Leader Ayatollah Ruhollah Khomeini during a rally outside the former U.S. embassy in Tehran (Credit: Reuters/Raheb Homavandi)

An Iranian student holds a picture of Supreme Leader Ayatollah Ali Khamenei (L) and Iran's Late Leader Ayatollah Ruhollah Khomeini during a rally outside the former U.S. embassy in Tehran (Credit: Reuters/Raheb Homavandi)