It's important to change the extension from txt to HTML before importing to Calibre. Otherwise the conversion will take forever.
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Before doing so, insert proper html tag so that it can be view correctly by browsers.
Add <h2> to all chapers
Add <h1> to title
Add <br/> to each line
Add html head, body etc.
Then convert to mobi with calibre and put
//h:h1
//h:h2
as level 1 and level 2 TOC correspondingly in the table of content section.
Feng
