Ключевые слова: address, background, birthday, blank, blue, business, card, color, coloured, colourful, communicate, communication, concept, copy, correspondence, delivery, design, email, envelope, envelopes, fun, green, greeting, group, holiday, icon, idea, information, invitation, letter, mail, mailbox, mailing, media, message, office, open, paper, pen, post, post office, postage, postal, propeller, receive, send, write, writing,