Exactly, that's along the lines of what I was alluding too (even if I wasn't explicit) in the last paragraph. And for the record, no that wouldn't have occured to me while debugging. Although when setting it up I probably would have explicitly set it to 100 to match :-D. And the other thing I was trying to allude to was there are some things that are just generally helpful in the long run.

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