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Williams attended the writing program at The Second City in Chicago and is also a graduate of the film program at the University of Texas at Austin .
 Williams, The Second City, Chicago, University of Texas at Austin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Williams, The Second City, Chicago, University of Texas at Austin