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Fred Stephen Roberts ( born June 19 , 1943 ) is an American mathematician , a professor of mathematics at Rutgers University and the director of DIMACS .
 Fred, Roberts, American, Rutgers University
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Fred, Roberts, American, Rutgers University