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After a year or two , he began to combine other disciplines with photography , but by the time he graduated from George Washington University in 1969 , he had remained self-taught .
 organization: George Washington University
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: George Washington University 
Answer:
 organization: George Washington University