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In July 2010 Zhang was appointed Communist Party Chief of Ningxia Hui Autonomous Region , replacing retiring Chen Jianguo as the top leader of the province-level region .
 Zhang, Communist, Ningxia Hui Autonomous Region, Chen Jianguo
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Zhang, Communist, Ningxia Hui Autonomous Region, Chen Jianguo