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Pavel Bergmann ( 14 February 1930 in Prague – 17 April 2005 in Prague ) was a Czech historian and a signatory to a Charter 77 .
 Bergmann, Prague, Prague, Czech, Charter 77
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bergmann, Prague, Prague, Czech, Charter 77