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During Emperor Xuanzong 's reign In 712 , Emperor Ruizong passed the throne to Li Longji , who took the throne as Emperor Xuanzong .
 Emperor Xuanzong, Emperor, Li Longji, Emperor Xuanzong
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Emperor Xuanzong, Emperor, Li Longji, Emperor Xuanzong