Ключевые слова: address, apartment, box, business, closed, colorless, communication, confidentiality, contact, corporation, correspondence, delivery, detail, education, envelope, furniture, hole, internal, key, keyhole, letter, letterbox, lock, locker, mail, mailbox, many, metal, metallic, number, office, paper, post, postage, postal, postbox, public, row, safe, secure, security, send, slot, sort, storage, urban, view, vintage, wall,