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Richard Burton , Rex Harrison , Roddy McDowall , and Martin Landau are featured in supporting roles .
 Richard Burton, Rex Harrison, Roddy McDowall, Martin Landau
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Richard Burton, Rex Harrison, Roddy McDowall, Martin Landau