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Today , the Hukou system is considered by various sources as the current caste system of China .
 location: Hukou; location: China
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Hukou, China 
Answer:
 location: Hukou; location: China