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In October 2007 , Goodman agreed to be acquired by Hellman & Friedman a San Francisco-based private equity firm in a $ 1.8 billion transaction .
 Goodman, Hellman & Friedman
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Goodman, Hellman & Friedman