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The Chi-Lites ( ) are a Chicago - based smooth soul vocal quartet from the early 1970s , one of the few from the period not to come from Memphis or Philadelphia .
 Chicago, Memphis, Philadelphia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Chicago, Memphis, Philadelphia