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He studied at Lviv Polytechnic and received his doctorate in 1929 at the Technical University in Aachen .
 Lviv Polytechnic, Technical University in Aachen
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Lviv Polytechnic, Technical University in Aachen