Context: In 2011, a Welsh club participated in the Premier League for the first time after Swansea City gained promotion. The first Premier League match to be played outside England was Swansea City's home match at the Liberty Stadium against Wigan Athletic on 20 August 2011. In 2012–13, Swansea qualified for the Europa League by winning the League Cup. The number of Welsh clubs in the Premier League increased to two for the first time in 2013–14, as Cardiff City gained promotion, but Cardiff City was relegated after its maiden season.

Question: When was Swansea City's home match played against Wigan Athletic?
Answer: Swansea City's home match at the Liberty Stadium against Wigan Athletic on 20 August 2011.

Question: Did Swansea qualify for the Europa Leaque in 2012-13?
Answer: In 2012–13, Swansea qualified for the Europa League

Question: How did Swansea qualify for the Europa League?
Answer: Swansea qualified for the Europa League by winning the League Cup.

Question: In 2013-14, how much did the Premier League's Welsh clubs increase by?
Answer: The number of Welsh clubs in the Premier League increased to two for the first time in 2013–14,

Question: Which team gained promotion then but was relegated after its first season?
Answer: in 2013–14, as Cardiff City gained promotion, but Cardiff City was relegated after its maiden season.

Question: In which year did a Welsh club participate in the Premier League for the first time?
Answer: 2011

Question: Which team was promoted to the Premier League in 2011?
Answer: Swansea City

Question: In which stadium was the first Premier League match played outside of England?
Answer: Liberty Stadium

Question: On which date did Swansea City play its first Premier League game?
Answer: 20 August 2011

Question: Against which team did Swansea City play its first Premier League game?
Answer: Wigan Athletic

Question: After Europa City gained promotion, which club participated in the Premier League for the first time?
Answer: Unanswerable

Question: In which year did a Europa city gain promotion and a Welsh club join the league?
Answer: Unanswerable

Question: After which city gained promotion did a Europa club join the Premier League?
Answer: Unanswerable

Question: Which city gained promotion in August 2011?
Answer: Unanswerable

Question: Who qualified for the league by being the winner of Wigan Athletic?
Answer: Unanswerable