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His son was Walter Giffard , 1st Earl of Buckingham ( d. 1102 ) .
 person: Walter Giffard , 1st Earl of Buckingham
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: Walter Giffard , 1st Earl of Buckingham 
Answer:
 person: Walter Giffard , 1st Earl of Buckingham