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Felten wrote a letter to Empress Elizabeth , and she extended her hospitality and a scholarship , so he completed his studies at the Russian Academy , graduating in 1752 as an architect .
 Felten, Elizabeth
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Felten, Elizabeth