FILE - In this July 27, 2017 file photo, a U.S.-backed Syrian Democratic Forces fighter runs in front of a damaged building as he crosses a street on the front line, in Raqqa, Syria. Syrian activists said Friday, Dec. 14, 2018 that U.S.-backed, Kurdish-led fighters have captured the last town held by the Islamic State group, in the militants' single remaining enclave in eastern Syria. (AP Photo/Hussein Malla, File)
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