FILE -In this Sunday, Dec. 31, 2017, photo, tourists line up for stepping up Angkor Wat temple outside Siem Reap, Cambodia. Commercial operations have begum at Cambodia’s newest and biggest airport, designed to serve as an upgraded gateway to the country’s major tourist attraction, the centuries-old Angkor Wat temple complex in the northwestern province of Siem Reap. (AP Photo/Heng Sinith, File)
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