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He has co-authored four books on software development : Design Driven Testing : Test Smarter , Not Harder , Use Case Driven Object Modeling with UML : Theory and Practice , Agile Development with ICONIX Process , and Extreme Programming Refactored : The Case Against XP .
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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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