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The team was made up of athletes from the whole United Kingdom ; athletes from Northern Ireland , who could later elect to hold Irish citizenship under the pre-1999 article 2 of the Irish constitution , were only eligible to represent Great Britain at this time .
 Northern Ireland, Britain
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Northern Ireland, Britain