If the Captchas are case sensitive then you will be notified.
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You can
earn up to $1 for solving 1000 Captcha & receive bonus for solving complicated Captchas.
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With 200,000 million Captchas solved each day,
Google's computers learn how to identify words scanned from books even if they're warped.
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Personally, I tend to find Captchas annoying,
and use them only as a last resort when a user has failed to log in a number of times and throttling delays are maxed out.
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It is important to understand the classes so that when you are shopping around for a CAPTCHA solving company,
you can make an informed decision based on what kind of Captchas you are looking to solve.