The easiest way for me is with search and replace
Takes a minute or two and is a bit tricky
first find a word in the book that should be double l's. Often easier to look in epub first
Hit magic wand (convert search and replace)
If word is 'follow' type fol into search box and hit test
Hit next
you will see fol ow
Copy entire word
Carefully delete the fo and ow leaving the l and the next character (looks like a space)
Hit ok
type ll as replacement text
make sure pdf input is selected and your prefered output is selected
Hit ok
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