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Shortly thereafter , actor Kirk Douglas announced Trumbo had written the screenplay for Stanley Kubrick 's film " Spartacus " ( also 1960 ) , adapted from the novel by Howard Fast .
 Kirk Douglas, Trumbo, Stanley Kubrick, Howard Fast
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kirk Douglas, Trumbo, Stanley Kubrick, Howard Fast