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He discovered Errico Malatesta , Peter Kropotkin , Henrik Ibsen and Friedrich Nietzsche , who Novatore often quoted , and especially Max Stirner .
 Errico Malatesta, Peter Kropotkin, Henrik Ibsen, Friedrich Nietzsche, Novatore, Max Stirner
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Errico Malatesta, Peter Kropotkin, Henrik Ibsen, Friedrich Nietzsche, Novatore, Max Stirner