abstract
abstraction
architecture
bastion
building
bulwark
castle
cell
citadel
concept
defense
dot
dotted
firmness
fort
fortification
fortified
fortress
geometric
gradient
guard
halftone
icon
illustration
matrix
mosaic
pattern
pictogram
pixel
point
privacy
private
rainbow
rectangle
rectangular
responsibility
secured
security
solid
solidity
spectral
spectrum
square
strength
stronghold
structure
tower
vector
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