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What sort of mobi books?
Where did the azw come from? Usually those are only from Amazon or else home made. Non-Amazon sites usually distribute old mobi or Calibre concept of "dual mobi".
No problem on PW3 and PW4 with "old mobi" from Calibre, azw from Calibre or dual mobi from Calibre (old mobi & AZW/KF8 in one file). No problem with Gutenberg mobi either.
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