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Germany national team Schröder has been a member of the German national under-18 and German national under-20 teams .
 German national under-18, German national under-20
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 German national under-18, German national under-20