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It really depends on the source. Some errors can be found by a simple spell checker, but some not of course. That is one of the reasons I started to create my tools to remove a lot of OCR errors. It can be spelling, but also punctuation that is going wrong. Not to mention styling an others. A lot cannot be found with the standard tools.
The better the source (and scan), the better the results of the OCR program. ABBYY is doing a good job is the scan is good.
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