Ключевые слова: background, birthday, blank, blue, business, card, color, colored, colorful, coloured, colourful, communication, copy, correspondence, design, envelope, fun, greeting, group, icon, information, invitation, isolated, letter, mail, mailbox, mailing, media, message, office, paper, post, post office, postal, propeller, red, rotor, send, spiral, stationery, symmetry, white, yellow,