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" Philadelphia " , colloquially " Philly " , is the largest city in the U.S. state of Pennsylvania , and the sixth-most populous U.S. city with a 2019 estimated population of 1,584,064 .
 Philadelphia, Philly, U.S., Pennsylvania, U.S.
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, Philly, U.S., Pennsylvania, U.S.