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He graduated from the Sofia Military School in 1916 with the rank of Lieutenant and participated in World War I with the 13th Regiment on the Macedonian Front , where he was promoted on 14 October 1917 to Senior Lieutenant .
 Sofia Military School
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sofia Military School