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The 1978 U.S. Pro Indoor was a men 's tennis tournament played on indoor carpet courts at the Wachovia Spectrum in Philadelphia , Pennsylvania in the United States .
 Philadelphia, Pennsylvania, 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:
 Philadelphia, Pennsylvania, United States