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Gold Heels ( foaled 1898 in Pennsylvania ) was an American Thoroughbred Champion racehorse who , in a two-year period , set one new stakers record and four track records , including a world record .
 Pennsylvania
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Pennsylvania