Ключевые слова: background, barb, barbed, barbwire, barrier, black, border, boundary, chain, closed, construction, crime, danger, dangerous, design, farm, fence, freedom, gray, guard, iron, isolated, isolation, jail, keep, law, metal, military, prevent, prison, prisoner, private, protection, razor, safety, secure, security, shape, sharp, sign, steel, symbol, system, war, warning, white, wire,