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The 1999 IGA SuperThrift Classic – Singles was the singles event of the fourteenth edition of the IGA SuperThrift Classic ; a WTA Tier III tournament held in Oklahoma City , United States .
 Oklahoma City, United States
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Oklahoma City, United States