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In 818 , after he reneged on an offer to submit three of Pinglu 's 12 prefectures to imperial control , Emperor Xianzong declared a campaign against him .
 person: Emperor Xianzong
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: Emperor Xianzong 
Answer:
 person: Emperor Xianzong