Ключевые слова: abstract, algebra, algorithm, backdrop, background, board, book, chalkboard, chemistry, college, communication, complex, concept, creative, dark, data, design, doodle, drawing, drawn, education, elearning, element, elements, formulas, hand, icons, idea, illustration, infographic, information, knowledge, math, mathematical, media, pattern, pencil, physics, pictogram, school, science, set, sign, sketch, social, student, study, supplies, symbol, wall,