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I try to avoid doing a full epub-->epub conversion unless necessary, as it can mess up other things. I just use the Tweak book function in Calbre, explode the book, add the following line to the .css file with a text editor, and then rebuild the book:
body { widows: 0; orphans: 0; }
It doesn't completely fix the problem, but it reduces it to a tolerable level.
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