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Riverdeep paid $ 1.75 billion in cash for the equity owned the private investment firms Thomas H. Lee Partners , Bain Capital and The Blackstone Group and assumed $ 1.61 billion in debt .
 Riverdeep, Thomas H. Lee Partners, Bain Capital, The Blackstone Group
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Riverdeep, Thomas H. Lee Partners, Bain Capital, The Blackstone Group