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This is part of a ÃÛÑ¿´«Ã½ Minute series on the Syrian conflict. Our Middle East Editor and Middle East correspondent Lina Sinjab explain why the rebels have collapsed. And although the Islamic State group is much weaker, there might be more similar groups. (Photo: An image grab taken from a propaganda video by the Islamic State group allegedly showing militants with guns and cars. Credit: ISIL/AFP/Getty Images)