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What you do is use ADE 2.0.1on your computer to check how your ePub looks and if it looks as you want with ADE, then you are good to go. You cannot use Sigil or Calibre to see how it looks. Sigil and Calibre can display some things differently and they can be more tolerant of errors that would be an issue for ADE. ADE is the #1 used software for displaying ePub. It is what most dedicated Readers use.
ePub 2 is easier to make than ePub 3 and in most cases, you would not need ePub 3. I actually convert ePub 3 back to ePub 2.
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