Ключевые слова: background, black, blackboard, blank, board, business, card, chalk, chalkboard, concept, contact, continent, dear, deliver, design, document, envelope, express, form, format, icon, idea, information, letter, mail, message, nobody, office, outlook, page, paper, pattern, post, postage, postal, postcard, postmark, receive, scheme, seal, send, service, sign, stamp, symbol, text, title, white, word, work,