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He then took a job in Strasbourg , in Alsace , then moved on to Freiburg , Germany where he joined the Working Men 's Educational Society , a socialist organization .
 Strasbourg, Alsace, Freiburg , Germany
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Strasbourg, Alsace, Freiburg , Germany