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Prior to his move to Regent , Helm was Professor of the History and Philosophy of Religion at King 's College , London .
 Regent, Helm, King 's College , London
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Regent, Helm, King 's College , London