Well not knowing how does constitute a problem. Which is fine, nothing wrong with that. We've all been there, and still are. But having an example of what's been tried and why (what you think you are butting your head against) is always good. Of course there is nothing *for* getnotes here... Sometimes a monk (myself included) will rise to the occasion and write your code for you, but you'll have more fun if you provide an appetizer.

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perl -pe "s/\b;([st])/'\1/mg"