abstract
area
barb
barbed
barbed tape
barbwire
barrier
border
chain
cloud
concentration
crime
danger
defense
fence
forbidden
freedom
grid
guard
gulag
industry
iron
jail
liberty
metal
metal wire
metallic
military
nature
prison
prisoner
private
protect
protection
protective
razor
restriction
safety
security
shape
sharp
stop
stretched
wall
war
warning
wire
wire fence
wired
zone
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