Ключевые слова: app, audiobook, book, bookstore, cartoon, color, contour, device, diary, dictionary, digital, drawing, e book, e library, ebook, education, electronic, elibrary, encyclopedia, ereader, icon, illustration, isolated, knowledge, learning, library, line, linear, lineart, literary, literature, notebook, novel, open, organizer, outline, paper, read, reader, school, set, stack, study, symbol, tablet, text, textbook, virtual, web,