Question: What years have leinster won the heineken cup?
Disambiguated questions and answers: question: What year did Leinster win its second Heineken Cup?
What year did Leinster win its third Heineken Cup?
What year did Leinster win its fourth Heineken Cup?
answer: 2010-11
2011-12
2017-18
Natural Questions answer: 2011 -- 12
2017 -- 18
2008 -- 09
2010 -- 11 (from the Wikipedia article "Leinster Rugby")