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Hong Kong, Kowloon, Mong Kok. 19th of October, 2014. Pro democratic protesters guard a barricade in Mong Kok. They use facial mask in case police attack them with pepper spray (Photo by Miguel Candela/NurPhoto) (Photo by NurPhoto/NurPhoto via Getty Images)

Hong Kong, Kowloon, Mong Kok. 19th of October, 2014. Pro democratic protesters guard a barricade in Mong Kok. They use facial mask in case police attack them with pepper spray (Photo by Miguel Candela/NurPhoto) (Photo by NurPhoto/NurPhoto via Getty Images)