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I have a pdf book where every other page is, I think, an image whilst the other page is normal text. On the image pages I cannot use the dictionary, the font is different and less clear and are spots on the pages as if there were dust on the scanner or page.
I also noticed that it seems that there are more mistakes in older books and those written by unknown writers. Luckily I haven't had an ebook that was unreadable because of OCR or grammar mistakes.
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