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Rex Ellingwood Beach ( September 1 , 1877 – December 7 , 1949 ) was an American novelist , playwright , and Olympic water polo player .
 Rex, Beach, American
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Rex, Beach, American