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https://www.washingtonpost.com/wp-apps/imrs.php?src=https://arc-anglerfish-washpost-prod-washpost.s3.amazonaws.com/public/BUVTQ3RSNOIAJKFB3UUUG72A4I_size-normalized.jpg&w=1440The lightning advance by the Islamist militant group Hayat Tahrir al-Sham abruptly redrew the front lines of Syria’s civil war for the first time in years.