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The comic was originally written by Kirkman with pencils by Ryan Ottley , layouts by Greg Capullo , and inks by McFarlane .
 Kirkman, Ryan Ottley, Greg Capullo, McFarlane
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kirkman, Ryan Ottley, Greg Capullo, McFarlane