Have you ever accidentally purchased a book twice?
I've had this happen before, though always with the freebies.
I see an interesting-looking book, decide to grab it, and then Calibre informs me that it's a duplicate of a book in my library. (Or, if I'd cleaned the title of "a novel of blahblah" crap, I occasionally fail to notice until later.)
Ah, the problems of purchasing eBooks from multiple websites.
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