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In 1955 , William Levitt built present-day Willingboro based on his Levittown model , which came to be used for other suburban developments .
 William Levitt, Willingboro, Levittown
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 William Levitt, Willingboro, Levittown