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AZW3 doesn't contain an EPUB -- however, KindleUnpack is quite skilled at unpacking the HTML resources and assembling them into an EPUB.
This is because AZW3 is an updated and vastly improved version of MOBI (which is sometimes named .azw), and will also give better results when converting with calibre.
Aside -- if you try to import an AZW and an AZW3, you get a duplicate warning because both have the same title/author, and they weren't added as same-book-different-formats. calibre includes a Merge books feature, in case you want both formats in calibre.
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