Blue key and white envelope.
Schlüsselwörter
key,
blue,
envelope,
white,
mail,
letter,
symbol,
icon,
communication,
security,
lock,
unlock,
message,
post,
correspondence,
crypt,
safety,
access,
permission,
code,
physical,
object,
hardware,
stationery,
paper,
container,
delivery,
express,
postal,
service,
information,
exchange,
news,
report,
announcement,
notification,
update,
alert,
signal,
reminder,
hint,
signs,
cue,
intimation,
colours,
colourful,
bright
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