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 is the longest serving manager in premier league?" whose answer is Arsène Wenger.
Each document should contain about 30 words, and these documents should contain useful information.

Query: longest serving manager in premier league
Useful Output:

Doc 1: 1. Arsene Wenger (1996-2018)  Arsenal's legendary Arsene Wenger is the longest-serving manager in Premier League history, with 7,894 days as
Doc 2: The Premier League's longest serving manager is Jurgen Klopp, who is in his eighth year at Liverpool. And despite the Reds sitting eighth after
Doc 3: 1. Arsene Wenger (Arsenal) – 7,894 days (1996-2018). There were many eyebrows raised when Arsene Wenger was appointed as Arsenal's manager in
Doc 4: Simon Weaver is currently the longest-serving manager in the top four divisions, having managed Harrogate Town since May 2009, though eleven of those years were
Doc 5: ABDOULRAHMAN EL-IDREEZ in the best 5 leagues in Europe. Right now these managers have been managing their said clubs for the longest.