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He articled for Edward Greenspan and Marc Rosenberg in 1990 and then practiced law at the firm of Greenspan , Rosenberg and Buhr , becoming a partner in 1998 .
 Edward Greenspan, Marc Rosenberg, Greenspan, Rosenberg
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Edward Greenspan, Marc Rosenberg, Greenspan, Rosenberg