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He is a past president of the Society of Christian Philosophers and the Søren Kierkegaard Society .
 Society of Christian Philosophers, Søren Kierkegaard
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Society of Christian Philosophers, Søren Kierkegaard