Ключевые слова: advice, broom, caution, clean, cleaner, cleaning, communication, danger, desk, fall, floor, front, hardwood, hazard, house, icon, indoor, information, interior, janitor, janitorial, lobby, maintenance, message, mop, mopping, object, office, plastic, prevention, professional, protection, red, risk, safety, service, sign, signal, simplicity, slip, slippery, surface, symbol, text, wall, warning, washing, wet, work, yellow,