Ключевые слова: class, college, computer, concept, contour, course, design, dialog, diploma, distant, ebook, education, element, graphic, homework, icon, illustration, internet, isolated, knowledge, language, lecture, lesson, line, linear, monochrome, online, outline, platform, practicing, set, sign, silhouette, student, symbol, thin, training, tutorial, university, web, webinar, website, workshop,