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From the Pomeranian bridgehead , Gustavus Adolphus advanced further south into Brandenburg in early January 1631 .
 Gustavus Adolphus, Brandenburg
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gustavus Adolphus, Brandenburg