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But when the Frankford Athletic Association in Philadelphia contacted him about playing for the Frankford Yellow Jackets , the defending NFL champion , he returned .
 Frankford, Philadelphia, Frankford Yellow Jackets
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Frankford, Philadelphia, Frankford Yellow Jackets