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He was minister-president of Baden-Württemberg and chairman of the CDU state party group from 1991 to 2005 , serving as President of the Bundesrat in 1996/97 .
 Baden-Württemberg, CDU state party group
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Baden-Württemberg, CDU state party group