Ключевые слова: addresser, background, blue, closed, color, colorful, communication, concept, copy, correspondence, deliver, delivering, delivery, design, envelope, envelopes, flat, frame, group, information, invitation, lay, letter, light, mail, mailing, many, message, nobody, object, packet, paper, post, postal, receive, send, sender, service, shipment, simple, simplicity, space, stationery, text, top, transfer, transferring, view, vintage,