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In addition to Hans Christian Andersen , Ingwersen 's regular couses included Søren Kirkegaard as well as special attention to ballad s and folktale s , addressing more that 15,000 students over the years .
 Hans, Andersen, Søren Kirkegaard
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Hans, Andersen, Søren Kirkegaard