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My program just retrieves all unique characters used for that specific font en removes all other glyphs from the font. It does not matter if the font is installed, as it only works with fonts embedded in the ePUB. It will take into account the whole font-family. So, if a character is used bold-italic but not in italic, it will be removed from the italic font but not the bold-italic font.
There is way to get all the characters in your ePUB. These will not be specified per font, but all. There is a report in Sigil called 'Characters in HTML files'.
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