Ключевые слова: apartment, architecture, arrangement, array, background, bill, box, building, business, communication, condominium, confidentiality, contact, delivery, door, drawer, drop, envelope, individual, interior, key, letter, letterbox, line, lock, locker, mail, mail box, mailbox, many, message, metal, notice, number, office, paper, pattern, post, postbox, privacy, room, school, security, sign, texture, tidy, urban, wall, wood, wooden,