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The collective is based around the two original members and frontwomen Olga Pulatova ( Ольга Пулатова ) and Olena Voinarovska ( Олена Войнаровська ) who write the lyrics , perform vocals and previously wrote all the music .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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