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Prefacing his Greenpeace years , in 1970 as a multimedia artist he won a scholarship to California Institute of the Arts , but then lost it when he offended his mentor Allen Kaprow .
 Greenpeace, California Institute of the Arts, Allen Kaprow
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Greenpeace, California Institute of the Arts, Allen Kaprow