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Ingebretsen worked with Pixar co-founder Ed Catmull in 1972 to produce one of the first digital films , a 20-second portrait of a human hand .
 Ingebretsen, Pixar, Ed Catmull
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ingebretsen, Pixar, Ed Catmull