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The oldest continuously operating theatre in the English-speaking world and the oldest theatre in the United States , the Walnut Street Theatre in Philadelphia was built by Pépin and Breschard in 1809 .
 Philadelphia, Pépin, Breschard
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, Pépin, Breschard