File -- In this Sunday, May 5, 2013 file photo former Iranian vice president Mohammad Reza Aref speaks during a press Conference announcing his candidacy in the June 14, 2013 presidential election. Iranian pro-reform candidate, Mohammad Reza Aref, pulled out of this week's presidential election on Tuesday to give support to a centrist whose campaign has gained momentum in recent days. (AP Photo/Ebrahim Noroozi, File)

Associated Press
File -- In this Sunday, May 5, 2013 file photo former Iranian vice president Mohammad Reza Aref speaks during a press Conference announcing his candidacy in the June 14, 2013 presidential election. Iranian pro-reform candidate, Mohammad Reza Aref, pulled out of this week's presidential election on Tuesday to give support to a centrist whose campaign has gained momentum in recent days. (AP Photo/Ebrahim Noroozi, File)
File -- In this Sunday, May 5, 2013 file photo former Iranian vice president Mohammad Reza Aref speaks during a press Conference announcing his candidacy in the June 14, 2013 presidential election. Iranian pro-reform candidate, Mohammad Reza Aref, pulled out of this week's presidential election on Tuesday to give support to a centrist whose campaign has gained momentum in recent days. (AP Photo/Ebrahim Noroozi, File)
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