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One possible explanation is typographical ligatures. If, for example, the original pdf file used a ligature glyph for the 'll' sequence, it may convert to a single l followed by a space. I haven't seen this with ll in particular (is there even a ligature for that?), but I have seen it with 'fl' ligatures turning into 'f ' (that's an f followed by a space).
Or it could be some other thing entirely, of course.
Xenophon
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