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esllou - 12:07 am on Nov 5, 2006 (gmt 0)
2 and 2 the key is using a captcha response that isn't in the original image - and numbers seems the best way of doing that.
OCR is one thing, being able to actually process what is written is still far beyond computers. What do you teach them to understand?
2 plus 2
sum of 2 and 2
2 + 2
and so on...