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Photo by: Muhammed Muheisen

With a backdrop of a portrait of China's late communist leader Mao Zedong, center, a Chinese paramilitary policeman, right, stands still while another yawns while marching, in Tiananmen Square in Beijing on Friday, June 4, 2010. Chinese authorities tightened security on the vast square during the anniversary of the deadly 1989 crackdown on pro-democracy protestors, which was marked Friday. (AP Photo/Muhammed Muheisen)

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