Ключевые слова: biology, book, brain, bus, cap, chemistry, college, computer, concept, design, digital, diploma, e, editable, education, elearning, flat, geometry, graduation, hat, icon, illustration, isolated, laptop, learning, lesson, library, line, mathematics, microscope, online, outline, pictogram, school, set, simple, stroke, student, study, textbook, thin, training, university, web, webinar, white, yellow,