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Otto Pächt ( 7 September 1902 , Vienna - 17 April 1988 , Vienna ) was an Austria n art historian .
 Otto Pächt, Vienna, Vienna, Austria
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Otto Pächt, Vienna, Vienna, Austria