Ключевые слова: abuja, address, airmail, anniversary, bill, black pen, card, celebration, communication, concept, congratulation, copy space, correspondence, craft, delivery, document, education, email, envelope, exchange, holding, investment, invitation, letter, letter of happiness, mail, mailing, message, modern, national, national holiday, nationality, nigeria, nigeria flag, nigerian, nigerian flag, paper, payment, pen, pictogram, post, post office, postage, postcard, registration, retro postage, student, symbol,