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A school trained chemist , his Irish Republican Army activity during the Irish War of Independence began in 1915 with the 1st Cork Brigade and ended shortly after the Irish Civil War came to a close in 1923 .
 organization: Irish Republican Army
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: Irish Republican Army