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The 1998 WTA German Open was a women 's tennis tournament played on outdoor clay courts at the Rot-Weiss Tennis Club in Berlin in Germany that was part of Tier I of the 1998 WTA Tour .
 Berlin, Germany
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Berlin, Germany