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Helen Herz Cohen ( 1912 – March 23 , 2006 ) was the Director of Camp Walden , an all-girls residential summer camp located in Denmark , Maine .
 Helen Herz Cohen, Camp, Denmark, Maine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Helen Herz Cohen, Camp, Denmark, Maine