An investor reacts in front of a screen showing stock market movements in Hangzhou, eastern China's Zhejiang province on July 7, 2015. Chinese shares took another tumble on July 7, defying government efforts to arrest a precipitous fall that has wiped an estimated $3.2 trillion off markets and threatens the world's number-two economy. AFP PHOTO CHINA OUT (Photo credit should read STR/AFP/Getty Images)
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