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(FILES) In this picture taken on September 14, 2013, the commander of the Iranian Revolutionary Guard's Quds Force, Gen. Qassem Suleimani, is seen as people pay their condolences following the death of his mother in Tehran. For a man widely reported to be playing a key role in helping Iraq's routed military recover lost ground, Qassem Suleimani, 57, the commander of Iran's feared Quds Force, remains invisible. AFP PHOTO/ISNA/MEHDI GHASEMIMEHDI GHASEMI/AFP/Getty Images
(FILES) In this picture taken on September 14, 2013, the commander of the Iranian Revolutionary Guard's Quds Force, Gen. Qassem Suleimani, is seen as people pay their condolences following the death of his mother in Tehran. For a man widely reported to be playing a key role in helping Iraq's routed military recover lost ground, Qassem Suleimani, 57, the commander of Iran's feared Quds Force, remains invisible. AFP PHOTO/ISNA/MEHDI GHASEMIMEHDI GHASEMI/AFP/Getty Images

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Can Washington work together with Iran and their mysterious General Suleimani? CNN's Reza Sayah reports.

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Can Washington work together with Iran and their mysterious General Suleimani? CNN's Reza Sayah reports.