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Think of Katy Perry 's " Firework " or Natasha Bedingfield 's " Unwritten " .
 Katy Perry, Natasha Bedingfield
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Katy Perry, Natasha Bedingfield