Ключевые слова: art, cash, check, checklist, clean, clipboard, color, colorful, concept, confirmed, contour, crystal, dental, dentist, document, dollar, form, guard, home, icon, illustration, insurance, isolated, jewel, line, linear, list, lock, machine, mark, money, office, outline, paper, pen, pop, popart, protect, protection, safety, scale, security, set, shield, sign, stone, symbol,