Ключевые слова: apartment, arrangement, array, background, bill, business, communication, company, condominium, confidentiality, contact, corporation, delivery, envelope, exchange, faculty, key, lattice, letter, letterbox, line, lock, locker, mail, mailbox, many, marker, message, metal, metallic, notice, number, office, pattern, post, postbox, privacy, security, sign, texture, tidy, town, urban, wall, wood, wooden,