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During Emperor Xuanzong 's reign Duan Xiushi was born in 719 , during the reign of Emperor Xuanzong .
 Emperor Xuanzong, Duan Xiushi, 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, Duan Xiushi, Emperor Xuanzong