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Harlan Philip Hanson ( February 18 , 1925 – November 28 , 1996 ) , also known as " Harpo " Hanson , was an American educator and the Director of the Advanced Placement Program from 1965 to 1989 .
 Harlan, Hanson, Hanson
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Harlan, Hanson, Hanson