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From a testing approach, limited to errors in text itself, of which there are likely to be many, you could take each section of the book and copy it onto the clipboard from a program which displays epubs.
Then you could paste it into Word or other word processing program which has both spelling and grammar correction and do a spelling/grammar check. You could then fix the errors in Calibre's new editor program or in Sigil or even edit the original in a text editing program.
This may speed up the process from forever to way too long.
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