You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "how many years were arsenal in the champions league?" whose answer is nineteen.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Arsenal Champions League years
Useful Output:

Doc 1: But they did compete in Europe's primary club tournament for 19 seasons in a row from 1998/99 to 2016/17. Since then, the Gunners have had to make do with the
Doc 2: Can Arsenal do the unthinkable and beat Real Madrid again, 19 years on from last time with Thierry Henry? Join me (and Thierry Henry) for a
Doc 3: While they had two European Cup campaigns in 1971 and 1991, they have now appeared in 20 of the last 26 editions of the UEFA Champions League.
Doc 4: Between 1998/9 and 2016/17, Arsenal took part in every edition of the Champions League - either directly in the group stage or in the
Doc 5: Hansi Flick's side is looking to win a first Champions League title in 10 years – back when Lionel Messi, Luis Suárez and Neymar famously led