access
annoyance
area
attempts
background
bot
button
capabilities
captcha
care
code
computer
computers
digital
generate
icons
image
internet
letters
login
name
obstacle
password
picture
prevention
protection
public
random
robot
safe
screen
security
site
spam
submit
symbol
system
technology
tell
test
text
turing
type
user
web
website
white
words
worry
定額
Captcha, I am not a robot.の素材 [FY310120808372]
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