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Well, if the hall in the hall is a full -length mirror, so that before the exit it can be seen from the outside. For these purposes, cabinets with mirror doors, wardrobes-wardrobes, or, if there is not a lot of space, at least just a large mirror on the wall are very convenient for these purposes. Some believe that this is a long -beaten and not original solution, and refuse it. But, as experience shows, it is difficult to do without a large mirror in the hallway and many later acquire it.