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2 ) The deep implications of the death of his father , which induced Witkin to explore mortality and the underlying reality of personal and social relationships , which is evident in his portraits and the characterizations in his narrative work .
 Witkin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Witkin