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In order to perform a fast and efficient search for the users in our <b>Firebase Database</b>, we'll first need to fetch all of our users with an observation. Once we build our list of users, we'll present it inside of our <b>UserSearchController</b>. Next, we'll examine the behavior of delegating our search bar behavior to detect when the search text is changed. Finally, we can perform a filtering of our users so that our list responds when searching.