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In 2010 she appeared as a possessed teenager in the Spanish-American horror film Exorcismus , alongside Richard Felix , Doug Bradley and Stephen Billington .
 Richard Felix, Doug Bradley, Stephen Billington
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 Felix, Doug Bradley, Stephen Billington