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Master, after realizing that the book had been deleted spontaneously, I added each copy on my computer to calibre and checked for the deleted book. And then when I realized that they were not self-deleting books, I deleted them myself. One of them may be a self-deleting book. But I don't know which one it is. I just started using caliber. I don't quite know how to use it. Thank you for your interest.
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