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Occasionally , the surname Gahan may be an Anglicised form of the Irish language Mac Gaoithín , meaning " son of Gaoithín " , although the more common Anglicised form of this Gaelic name is McGeehan in Ulster .
 location: Ulster
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: Ulster 
Answer:
 location: Ulster