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Cellach mac Brain ( died 834 ) was a King of Leinster of the Uí Muiredaig sept of the Uí Dúnlainge branch of the Laigin .
 person: Cellach mac Brain
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: Cellach mac Brain 
Answer:
 person: Cellach mac Brain