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In November 1997 , Matthias Ettrich and Matthias Kalle Dalheimer registered KDE e.V. as association in Tübingen under German law , and became president and vice president .
 Matthias Ettrich, Matthias Kalle Dalheimer, Tübingen
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Matthias Ettrich, Matthias Kalle Dalheimer, Tübingen