user: Why are so many NFL coaches related to each other?

assistant: The most common path towards acquiring a coaching job in the NFL is through connections to family or friends who are already employed by an NFL franchise in a coaching or playing capacity. Historically, people have criticized the league for not employing steeper measures to reduce nepotism among coaching staffs, however, there is little the league can do to prevent this as many coaches prefer to employ staff they are already familiar with.

user: Extract and list the names of characters a player can control in The Last of Us mentioned in the paragraph. Also describe relationships between those characters.

assistant: Joel: The man who is controlled by the player most of the game.
Ellie: A young girl who is being escorted by Joel across a post-apocalyptic United States.
Sarah: Joel's daughter.

user: Why does my back hurt?

assistant: There are several reason why your back might hurt.  Generally, the problem starts not in your back but in a connected muscle group. To assess the problem, start with your feet and work your way up to your shoulders and neck.   If your shoulders and/or neck are tight, that will affect your back muscles.  Also, consider your shoes, your weight, the strength of your knees, and your core strength.