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Located at 5700 N.E. 39th Avenue , the school opened in 1969 and its curriculum was developed by four Harvard Graduate School of Education alumni and gained national attention for its unique and sometimes controversial approach to secondary education .
 Harvard Graduate School of Education
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Harvard Graduate School of Education