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Ryazhsk ( ) is town and the administrative center of Ryazhsky District of Ryazan Oblast , Russia , located south of Ryazan .
 Ryazhsk, Ryazan Oblast, Russia, Ryazan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ryazhsk, Ryazan Oblast, Russia, Ryazan