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Ключевые слова:
abstract, architecture, background, banister, building, crisscross, cross, danger, down, emergency, enclosure, escape, evacuation, exit, external, factory, fence, fire, floor, grid, handrail, industry, innovation, iron, ladder, metal, modern, net, outside, railing, rescue, safe, safety, section, security, sraircase, stage, stair, stairway, steel, step, structure, town, up, urban, wall,