Ключевые слова: anniversary, background, blank, celebration, classified, communication, confidential, container, correspondence, cover, decorative, dirty, document, empty, envelope, file, group, invitation, isolated, letter, mail, message, note, object, office, old, open, package, paper, post, postage, postal, postcard, present, retro, secret, send, sign, single, space, special, surprise, text, top, wood, wooden, yellow,