Ключевые слова: 20, 80, analysis, background, business, color, colorful, concept, conceptual, design, economic, education, efficiency, effort, eighty, factor, few, flat, green, law, lay, magnet, management, nobody, numbers, object, pareto, percentage, percents, plastic, presentation, principle, productivity, proportion, red, result, rule, sparsity, table, top, twenty, view, vital, wooden,