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As several people suggested, I turned off Heuristic Processing. The conversion worked fine that way. Since this is the first time I've run into such a problem, I've got to wonder what this book is doing that's different enough to cause problems (of course, a hint might be that EpubCheck even fails to run on it at all). I guess I'll work my way through the list of heuristics and see if any individual one causes a problem. Of course, it's not vital to do that since I was able to get and edit the book as an epub3 via KindleUnpack. But, it might be interesting.
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