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Arnulf was the son of Dirk II , Count of Holland and Hildegard , thought to be a daughter of Arnulf of Flanders .
 person: Arnulf; person: Dirk II , Count of Holland; person: Arnulf of Flanders
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: Arnulf, Dirk II , Count of Holland, Arnulf of Flanders 
Answer:
 person: Arnulf; person: Dirk II , Count of Holland; person: Arnulf of Flanders