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He studied in the Brussels Military Academy and the Cavalry School at Ypres , joining the Hellenic Army in 1906 as a Cavalry 2nd Lieutenant .
 Brussels, Ypres
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Brussels, Ypres