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Under Western Stars ( 1938 ) is an American Western film starring Roy Rogers and Smiley Burnette .
 American, Roy Rogers, Smiley Burnette
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 American, Roy Rogers, Smiley Burnette