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David was a pupil of Louis Spohr and Moritz Hauptmann from 1823 to 1824 and in 1826 became a violinist at Königstädtischen Theater in Berlin .
 Louis Spohr, Moritz Hauptmann, Berlin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Louis Spohr, Moritz Hauptmann, Berlin