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Seal Of Secrecy
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Thesaurus
Berlin wall
Pillars of Hercules
arch dam
backstop
bank
bar
barrage
barrier
barrier of secrecy
bear-trap dam
beaver dam
blackout
boom
border
border ground
borderland
breakwater
breastwork
brick wall
buffer
bulkhead
bulwark
censorship
cofferdam
curtain
dam
defense
dike
ditch
earthwork
embankment
fence
frontier
frontier post
gate
gravity dam
groin
hush-up
hydraulic-fill dam
iron curtain
ironbound security
jam
jetty
leaping weir
levee
logjam
march
marches
marchland
milldam
moat
mole
mound
oath of secrecy
official secrecy
outpost
outskirts
pall
parapet
portcullis
rampart
repression
roadblock
rock-fill dam
seal of secrecy
seawall
security
shutter dam
smothering
stifling
stone wall
suppression
three-mile limit
twelve-mile limit
veil
veil of secrecy
wall
weir
wicket dam
work
wraps
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