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Like Chen Jiongming , Zhao was an advocate of a federalist constitution , but Mao Zedong thought his motive was to retain his own power rather than improve the governance of his country .
 Chen Jiongming, Zhao, Mao Zedong
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Chen Jiongming, Zhao, Mao Zedong