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Premise and background On ABC 's mystery television show Castle , Richard Castle is a best-selling author who is a consultant to the NYPD and is assigned to Detective Kate Beckett , who is his muse for the series .
 ABC, NYPD
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 ABC, NYPD