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Nathan Law, 23, a leader of the 2014 pro-democracy rallies, campaigns for his political party Demosisto party during the Legislative Council election in Hong Kong on September 4, 2016.
Young Hong Kong independence activists calling for a complete break from China stood in major elections for the first time on September 4, the biggest vote since 2014 pro-democracy rallies.  / AFP / Anthony WALLACE        (Photo credit should read ANTHONY WALLACE/AFP/Getty Images)
Nathan Law, 23, a leader of the 2014 pro-democracy rallies, campaigns for his political party Demosisto party during the Legislative Council election in Hong Kong on September 4, 2016.
Young Hong Kong independence activists calling for a complete break from China stood in major elections for the first time on September 4, the biggest vote since 2014 pro-democracy rallies.  / AFP / Anthony WALLACE        (Photo credit should read ANTHONY WALLACE/AFP/Getty Images)

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As the Umbrella Movement in Hong Kong makes gains in the legislature, CNN's Kristie Lu Stout looks at why that represents a challenge to Chinese authorities.