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Oedipus rex is an " Opera - oratorio after Sophocles " by Igor Stravinsky , scored for orchestra , speaker , soloists , and male chorus .
 Opera, Sophocles, Igor Stravinsky
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Opera, Sophocles, Igor Stravinsky