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Ulster A verstaile back , who can play at out-half , full-back or in the centre , Stuart Olding has represented Ireland at both Under 18 and Under 20 level He made his debut for Ulster as a substitue against Leinster in December 2011 , but just over a year later he established himself as a valued member of the senior squad .
 Ulster, Ulster
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ulster, Ulster