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