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FILE- The Chinese flag flies at a plaza near the Potala Palace in Lhasa in western China's Tibet Autonomous Region, June 1, 2021, as seen during a government organized visit for foreign journalists. (AP Photo/Mark Schiefelbein, File)

FILE- The Chinese flag flies at a plaza near the Potala Palace in Lhasa in western China's Tibet Autonomous Region, June 1, 2021, as seen during a government organized visit for foreign journalists. (AP Photo/Mark Schiefelbein, File)

FILE - A police officer directs traffic near a billboard that reads in Chinese "Study Communist Party history, understand its theories, do practical work, and make new advances" in Nyingchi in western China's Tibet Autonomous Region, as seen during a rare government-led tour of the region for foreign journalists, June 4, 2021. (AP Photo/Mark Schiefelbein, File)

FILE - A police officer directs traffic near a billboard that reads in Chinese "Study Communist Party history, understand its theories, do practical work, and make new advances" in Nyingchi in western China's Tibet Autonomous Region, as seen during a rare government-led tour of the region for foreign journalists, June 4, 2021. (AP Photo/Mark Schiefelbein, File)