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Ключевые слова:
accident, alertness, caution, caution slippery surface sign, caution wet floor, clean, color image, danger, falling, floor, gray, horizontal, indoors, information sign, information symbol, modern, new, outdoors, pole, risk, safety, sign, single object, slippery, slippery surface sign, snow, stair, staircase, stairway, step, steps, stumbling, tripping, warning sign, warning symbol, wet, winter, yellow,