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Since the play 's first publication in 1922 , critics have paid more attention to Percy Shelley 's lyrics than Mary Shelley 's drama .
 Percy Shelley, Shelley
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Percy Shelley, Shelley