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I think it's because the characters are missing in the font. If so, using a different font will solve the problem. To do this, you need to copy a new font onto the reader, then use Calibre to "tell the book" to use that font. Someone has made a helpful PDF about it: Search this forum for "Guide to changing fonts." For a font with a full character set, try Times New Roman or Georgia.
eP
eP
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