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During Ming and Qing Dynasties , seal arts were quite prosperous in China , especially in the Yangtze River Delta region , where there 's a continuous rich tradition of humanities and arts .
 Yangtze River Delta
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Yangtze River Delta