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In 2011 , working in conjunction with University of Sheffield and the National Housing Federation , Neighbourhoods Green produced Greener Neighbourhoods a best practice guide to managing green space for social housing .
 University of Sheffield, Housing Federation
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 University of Sheffield, Housing Federation