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In this picture taken on May 29, 2019, tourists visit Tiananmen square in Beijing. - Thirty years after the crackdown on Tiananmen protesters, the tanks that lined Beijing's central avenue have been replaced by countless surveillance cameras perched like hawks on lampposts to keep the population in check. (Photo by STR / AFP) / To go with China-Politics-Tiananmen, Focus by Poornima Weerasekara (Photo credit should read STR/AFP/Getty Images)

In this picture taken on May 29, 2019, tourists visit Tiananmen square in Beijing. - Thirty years after the crackdown on Tiananmen protesters, the tanks that lined Beijing's central avenue have been replaced by countless surveillance cameras perched like hawks on lampposts to keep the population in check. (Photo by STR / AFP) / To go with China-Politics-Tiananmen, Focus by Poornima Weerasekara (Photo credit should read STR/AFP/Getty Images)
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