code: public RemoveUsersSavedTracksRequest.Builder removeUsersSavedTracks(String... ids) {
      return new RemoveUsersSavedTracksRequest.Builder(accessToken)
              .setDefaults(httpManager, scheme, host, port)
              .ids(concat(ids, ','));
    }
docs: Remove a track if saved to the users "Your Music" library.
  
  @param ids The track IDs to remove from the users Your Music library. Maximum: 50 IDs.
  @return A {@link RemoveUsersSavedTracksRequest.Builder}.
  @see <a href="https://developer.spotify.com/web-api/user-guide/#spotify-uris-and-ids">Spotify: URLs &amp; IDs</a>