Ключевые слова: abstract, article, articles, background, book, business, catalog, collection, communication, data, document, documentation, documents, editorial, education, educational, facts, finger, global, group, hand, heap, horizontal, information, isolated, learn, learning, magazine, materials, media, medium, monthly, newspaper, objects, office, page, paper, person, pile, print, printed, printing, publication, reading, report, stack, tabloid, white,