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Olyphant also served as a co-executive producer on " Justified " , working with Graham Yost and the writing team on some of the show 's storylines and coming to the set on his days off to work with guest stars .
 Olyphant, Graham Yost
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Olyphant, Graham Yost