accident
alarm
alert
art
attention
background
banner
beware
bright
button
car
caution
color
computer
danger
dangerous
design
disable
error
exclamation
failure
flat
graphic
hazard
icon
important
information
isolated
label
mark
newcomer
notice
outline
point
precaution
problem
prohibition
red
risk
road
safety
security
sign
sticker
symbol
traffic
triangle
warning
yellow
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