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Census workers use an app to collect information from a resident in Qingdao, in China's eastern Shandong province on November 1, 2020, as millions of census-takers began knocking on doors for a once-a-decade head count of the world's largest population that for the first time will use mobile apps to help crunch the massive numbers. (Photo by STR / AFP) / China OUT (KEYSTONE/AFP / AFP/STR)