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: "when did the first football player take a knee?" whose answer is September 1, 2016.
Each document should contain about 30 words, and these documents should contain useful information.

Query: first football player to take a knee
Useful Output:

Doc 1: The first person to take a knee was American Football quarterback Colin Kaepernick in 2016. He didn't like standing during the US national
Doc 2: The protests were inspired by San Francisco backup quarterback Colin Kaepernick, the first NFL player who chose to sit and take a knee
Doc 3: Former San Francisco 49ers quarterback Colin Kaepernick made headlines back in September 2016 when he took a knee for the first time in
Doc 4: American footballer Colin Kaepernick took the knee during the national anthem before a match in 2016. He said he could not stand to show pride
Doc 5: The anti-racism protest was first performed by American footballer Colin Kaepernick, who took the knee during the national anthem before a match