Ключевые слова: 404, accident, alarm, alert, attack, available, beware, broken, careful, caution, computing, crime, cyberspace, danger, dangerous, disconnect, error, exclamation, fail, failure, hazard, internet, maintenance, mistake, network, not found, notice, oops, page, problem, program, repair, risk, safety, security, service, sign, stop, support, symbol, system, technical, technology, trouble, update, upgrade, warn, web, webpage, website,