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After receiving his Ph.D. in Indology from Freiburg University in 1967 , he taught for 21 years at the South Asia Institute of Heidelberg University ( SAI ) .
 Freiburg University, Heidelberg University
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Freiburg University, Heidelberg University