Ключевые слова: apartment, architecture, box, building, business, confidential, courier, deliver, detail, drop, grain, hinges, hole, inbox, insert, interior, internal, keyhole, letter, line, lock, lockbox, locker, mail, mailbox, mailroom, many, material, metal, multiple, name, number, object, office, paper, perspective, pine, post, private, professor, public, row, safe, school, serie, slot, sort, storage, tag, wood, yellow,