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He imagined the application of his ideas to the design of a human community in his utopian novel , " Walden Two " ( 1948 ) , while his analysis of human behavior culminated in his work , " Verbal Behavior " .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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