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William Graham Walker ( born June 1 , 1935 ) is a veteran United States Foreign Service diplomat who served as the US ambassador to El Salvador and as the head of the Kosovo Verification Mission .
 person: Walker; location: El Salvador
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: Walker, El Salvador 
Answer:
 person: Walker; location: El Salvador