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Amongst their main exponents are Günter Brus , Otto Muehl and Hermann Nitsch , who developed most of their actionist activities between 1960 and 1971 .
 Günter Brus, Otto Muehl, Hermann Nitsch
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Günter Brus, Otto Muehl, Hermann Nitsch