Ключевые слова: abstract, art, blank, book, bookmark, business, chemistry, cog, color, computer, concept, design, diary, dictionary, discovery, education, element, gear, handbook, icon, idea, illustration, imagination, information, isolated, knowledge, learn, letter, literature, manual, microscope, molecule, object, open, page, paper, publication, reading, research, school, science, shape, sign, study, symbol, teach, textbook, white, wisdom,