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PDF is a format not made to exchange data but for displaying data to humans in exact the way the publuisher wants it to be displayed. At leaqst there is no formatting at all, headers are big and bold, and paragraphs are not bound together buu only have margins to other objects.
Calibre produces shit as every other converting tool, too. In that case better strip all CSS rules and rebuild the book from scratch. Even after that, you have paragrpahs wich belong together, soft hyphens not being taken back, misinterpreted italics and so on and so one.
The best way of converting is to use on OCR program like Abby Finereader or Omnioage, export the text as .doc, open it with atlantis word processor, checking all misinterpreted sectioins and then convert it to epub ( atlantis do have a suitable epub export), Even after that you need to check the result with sigil or any other source based tool.
There is NO easy process from pdf to epub regardless what the tool programmer promises.
The very best way is to have another format.
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