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Cooper joined the North American Vexillological Association in 1979 , serving as treasurer from 1980 to 1983 and president from 1983 to 1986 .
 North American Vexillological Association
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 North American Vexillological Association