In this task, you are given a question and a context passage. You have to answer the question based on the given passage.

What has to be done with lights in order for them to work?, Context: Entry lights can be used outside to illuminate and signal the entrance to a property. These lights are installed for safety, security, and for decoration.
installed

How does a chestnut tree form its heartwood?, Context: The term heartwood derives solely from its position and not from any vital importance to the tree. This is evidenced by the fact that a tree can thrive with its heart completely decayed. Some species begin to form heartwood very early in life, so having only a thin layer of live sapwood, while in others the change comes slowly. Thin sapwood is characteristic of such species as chestnut, black locust, mulberry, osage-orange, and sassafras, while in maple, ash, hickory, hackberry, beech, and pine, thick sapwood is the rule. Others never form heartwood.
the change comes slowly

Games are experienced through?, Context: The practice of playing one or two preseason exhibition games by each team before the start of the regular season was discontinued when the NBC contract was initiated, and the regular season was extended from 14 games, the length that it had been since 1996, to 16 from 2001 to 2010, and since 2016. From 2011 to 2015, the regular season league expanded to 18 games, with each team having two bye weeks and the option of two preseason games.

playing