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They were divorced in 1923 , and on June 11 , 1923 , he married the opera singer Barbara Kemp in Berlin-Charlottenburg .
 Barbara Kemp, Berlin-Charlottenburg
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Barbara Kemp, Berlin-Charlottenburg