51165
The Liechtenstein under-21s first attempted to qualify for the UEFA U-21 Championship in 2006 , where they played a home-and-home against Northern Ireland , losing 1-8 on aggregate , thus being eliminated from qualifying .
 Liechtenstein, Northern Ireland
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Liechtenstein, Northern Ireland