Ключевые слова: access, area, barriers, boundary, captivity, caution, cautionary, challenge, confinement, danger, defense, division, enclosure, entry, front, imprisonment, isolation, line, man, marker, measure, metal, observing, obstacle, outdoor, prison, protection, razor, restrict, restricted, restriction, security, standing, steel, surroundings, surveillance, territory, trespassing, wire, zone,