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From 1956 — 1957 , Billberg was performing in various American clubs located in Germany and France with vibraphonist Vera Auer .
 Billberg, American, Germany, France
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Billberg, American, Germany, France