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Do you know captcha? That great invention that minimize the spam registration? Well, there is a sort of a captcha that show that you are a human if you solve a simple equation, like 4+6= (and your write the result).
This is a filter for the people you want to deal with, combined with their urgency to contact you.
Imagine how funny it will be to have a captcha as a complicated equation, with radicals, large numbers, comma and stuff. And you can send the message only if you enter the correct result of that equation 
It’s very funny. Maybe I’ll do it sometimes.
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