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At MGM he was one of the main directors of their female stars ; he directed Joan Crawford six times and Greta Garbo seven .
 MGM, Joan Crawford, Greta Garbo
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 MGM, Joan Crawford, Greta Garbo