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During Emperor Renzong of Song 's final regnal era ( Jiayou , 1056-1063 ) Song Di held the posts of assistant for transport commission and vice director of administration in Changsha , an important commercial and administrative city located on along the lower reaches of the Xiang River .
 Emperor Renzong of Song, Song, Changsha
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 Renzong of Song, Song, Changsha