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The 1999 Warsaw Cup by Heros was a tennis tournament played on outdoor clay courts in Warsaw , Poland that was part of Tier IV of the 1999 WTA Tour .
 Warsaw, Warsaw, Poland
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Warsaw, Warsaw, Poland