abstract
arrest
background
barb
barbed
barbwire
barrier
blue
border
boundary
camp
cloud
concept
crime
danger
day
defense
escape
fence
forbidden
freedom
gaol
guard
hope
horizontal
iron
jail
metal
military
nature
nobody
outdoor
prison
prisoner
private
protect
protection
razor
refugee
safety
security
sharp
silhouette
sky
steel
stop
wall
war
white
wire
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