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Directed by Todd Phillips , who co-wrote the script with Craig Mazin and Scot Armstrong , the film stars Bradley Cooper , Ed Helms , Zach Galifianakis , Ken Jeong , Jeffrey Tambor , Justin Bartha , and Paul Giamatti .
 Todd Phillips, Craig Mazin, Scot Armstrong, Bradley Cooper, Ed Helms, Zach Galifianakis, Ken Jeong, Jeffrey Tambor, Justin Bartha, Paul Giamatti
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Todd Phillips, Craig Mazin, Scot Armstrong, Bradley Cooper, Ed Helms, Zach Galifianakis, Ken Jeong, Jeffrey Tambor, Justin Bartha, Paul Giamatti