An investor looks up in front of an electronic board showing stock information at a brokerage house in Fuyang, Anhui province, China August 21, 2015. China stock markets tanked more than 4 percent on Friday, taking weekly losses for the main indexes to nearly 12 percent and casting doubt over Beijing's ability to prevent another bout of panic selling as the market neared collapse again. REUTERS/China Daily CHINA OUT. NO COMMERCIAL OR EDITORIAL SALES IN CHINA - GF10000178232
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