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my test, before doing epub to mobi, is to open the epub with calibre viewer, if the viewer can find a toc, then so will kindle, after conversion. if the epub view test fails then it's back to sigil for some patching up, and/or do an epub to epub wiht the new hauristics stuff enabled.
sometimes it is necessary to take the bold step of deleting what appears to be the toc if it appears in an xhtml in sigil, & let the programs build a tag based replacement
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