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In January 1922 he became IRA Chief of Staff , replacing Richard Mulcahy .
 organization: IRA; person: Richard Mulcahy
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: IRA, Richard Mulcahy 
Answer:
 organization: IRA; person: Richard Mulcahy