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The National Center for Employee Ownership is a non-profit research organization started in 1979 when Corey Rosen , staff member in the United States Senate became involved in drafting legislation on employee stock ownership plans ( ESOPs ) .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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