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George T. Walker , the only sibling to survive William S. Walker , was a dean at Northwestern State University in Natchitoches and the retired president of the University of Louisiana at Monroe .
 Walker, Walker, Northwestern State University, Natchitoches, University of Louisiana at Monroe
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Walker, Walker, Northwestern State University, Natchitoches, University of Louisiana at Monroe