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Alexandra Panova and Urszula Radwańska are the defending champions , having won the event in 2012 .
 Alexandra Panova, Urszula Radwańska
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Alexandra Panova, Urszula Radwańska