A model shows a creation by fashion designer Chi Zhang at a rehearsal for Chi Zhang's fashion show in Beijing November 22, 2014. Zhang said China's air pollution is one of his prime inspirations and the embellished images of gas masks and the phrase "Fxxk Air Pollution" are trademarks in his creations. REUTERS/Kim Kyung-Hoon (CHINA - Tags: POLITICS SOCIETY ENVIRONMENT BUSINESS)

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