Ключевые слова: abstract, access, background, barbs, barrier, boundary, break, captivity, cloud, coil, concept, crime, cross, danger, dangerous, defense, detention, enclose, enclosed, enclosure, escape, fence, freedom, imprisoned, iron, mesh, metal, military, object, obstacle, perimeter, prevent, prevention, prison, privacy, private, protect, protection, razor, safety, secure, security, shine, sky, steel, twisted, war, wire,