Ключевые слова: address, background, black, blank, blue, business, card, color, communication, concept, correspondence, design, document, empty, envelope, envelopes, information, isolated, letter, letters, mail, mails, marker, message, object, office, open, package, page, pages, paper, pen, pencil, post, postage, postal, postcard, receive, red, send, service, sign, stamp, stationery, symbol, white, writing,