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After hearing a brief plot summary , King wondered why Libby had set the novel in Japan , and Libby responded : At that time , Libby also appeared on The Diane Rehm Show on National Public Radio to talk about the novel .
 Libby, Libby, Libby, National Public Radio
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Libby, Libby, Libby, National Public Radio