Why do I have to complete Captcha?

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Tags

1. #apart
2. #ensure
3. #automated
4. #security
5. #computers
6. #technique
7. #through
8. #completely
9. #between
10. #public
11. #check
12. #completing
13. #human
14. #captcha
15. #mainly
16. #complete
17. #users
18. #distinguish
19. #turing
20. #registration
21. #humans