combine — If you combine two or more things or if they combine, they exist together.
desegregate — To desegregate something such as a place, institution, or service means to officially stop keeping the people who use it in separate groups, especially groups that are defined by race.
free — enjoying personal rights or liberty, as a person who is not in slavery: a land of free people.
join — to bring in contact, connect, or bring or put together: to join hands; to join pages with a staple.
let go — to move or proceed, especially to or from something: They're going by bus.
open — not closed or barred at the time, as a doorway by a door, a window by a sash, or a gateway by a gate: to leave the windows open at night.