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Olia Tira ( born 1 August 1988 in Potsdam , East Germany ) is a singer based in Moldova .
 Olia Tira, Potsdam, East Germany, Moldova
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Olia Tira, Potsdam, East Germany, Moldova