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With Fritz Arno Wagner , he filmed F. W. Murnau 's The Haunted Castle ( 1921 ) .
 Fritz Arno Wagner, F. W. Murnau
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Fritz Arno Wagner, F. W. Murnau