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Though most of such playwrights , subsequently labeled " Absurdist " ( based on Esslin 's book ) , denied affiliations with existentialism and were often staunchly anti-philosophical ( for example Ionesco often claimed he identified more with ' Pataphysics or with Surrealism than with existentialism ) , the playwrights are often linked to existentialism based on Esslin 's observation .
 Absurdist, Esslin, Ionesco, Pataphysics, Surrealism, Esslin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Absurdist, Esslin, Ionesco, Pataphysics, Surrealism, Esslin