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US pop star Kesha sues music producer Dr Luke for ' years of sexual and emotional abuse ' : http://t.co/viWMwDeF1s
 US, Kesha, Dr Luke
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 US, Kesha, Dr Luke