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On several occasions , Derrida has acknowledged his debt to Husserl and Heidegger , and stated that without them he would not have said a single word .
 Derrida, Husserl, Heidegger
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Derrida, Husserl, Heidegger