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The critic E. Arnot Robertson observed : She concluded that " the subtle interpretation she insisted on giving " kept the focus on the teacher 's " sheer joy in imparting knowledge " .
 E. Arnot Robertson
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 E. Arnot Robertson