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The Hauptamt Volksdeutsche Mittelstelle organised an SS commando from Belgrade , Serbia , under Otto Lackman and " ... went from village to village , accompanied by the military . "
 SS, Belgrade, Serbia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 SS, Belgrade, Serbia