Ключевые слова: algebra, amount, analysis, art, blue, calculation, chart, color, colorful, concept, contour, coordinate, curve, design, diagram, drafting, drawing, education, excosecant, formula, function, graph, graphic, green, icon, illustration, isolated, knowledge, layout, learning, line, linear, lineart, math, mathematical, mathematics, outline, research, school, science, sign, sketching, study, studying, symbol, system, technical, value, x,