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HONG KONG - JUNE 01: A protester pedals a mock tank during the pro-democracy march through Hong Kong to mark the 25th anniversary of Tiananmen Square massacre on June 1, 2014. (Photo by Jessica Hromas/Getty Images)

HONG KONG - JUNE 01:  A protester pedals a mock tank during the pro-democracy march through Hong Kong to mark the 25th anniversary of Tiananmen Square massacre on June 1, 2014.  (Photo by Jessica Hromas/Getty Images)