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The first German tank destroyers were the " Panzerjäger " ( " tank hunters " ) , which mounted an existing anti-tank gun on a convenient chassis for mobility , usually with just a three-sided gun shield for crew protection .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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