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: "who has won the most uefa champions league cups?" whose answer is 21.
Each document should contain about 30 words, and these documents should contain useful information.

Query: clubs with most UEFA Champions League Cups/Cups Winners' Cup
Useful Output:

Doc 1: Teams with most Champions League - European Cup final match defeats!!
Doc 2: Juventus have been one of the most successful clubs in world football over the years, famous for their financial controversies in recent years
Doc 3: European Champion Clubs' Cup winner ; UEFA Champions League ; 23/24 · Real Madrid ; 22/23 · Manchester City ; 21/22 · Real Madrid
Doc 4: Real Madrid has won the most Champions League titles with 15. AC Milan is second with seven. Liverpool and Bayern Munich are tied for third with six wins
Doc 5: Record winner ; Real Madrid, 5 ; FC Barcelona, 3 ; Bayern Munich, 2 ; Sport Club Corinthians Paulista, 2.