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He is best known for creating the posters for many prominent Broadway productions , including the original productions of Stephen Sondheim 's Sweeney Todd : The Demon Barber of Fleet Street and Sunday in the Park with George .
 Broadway, Stephen Sondheim
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Broadway, Stephen Sondheim