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Gisela of Kerzenbroeck or Gisela von Kerssenbrock ( died by 1300 ) was a nun in the northern German city of Rulle who probably worked most of her life writing and illustrating manuscripts , as well as being choirmistress .
 German
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 German