Ключевые слова: abstract, background, black, book, bookstore, column, cover, design, dictionary, document, education, element, encyclopedia, flat, floral, glasses, graphic, icon, illustration, information, isolated, knowledge, leaf, learning, library, literature, object, open, page, paper, pile, publish, read, school, science, shape, sign, stack, study, studying, symbol, text, textbook, university, white, wisdom,