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I know someone who uses FlightCrew, ePubcheck 3.0.1, epudcheck 4 (still in alpha), and Calibre to validate and if it passes all of them (well, it could have an issue with epubcheck 4 as that could be a bug), it's good to go.
Whenever Sigil says it wants to correct something for me, I say no and do it myself.
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