A perl in time saves nine

I spent most of today writing vocabulary lists. The first stage (extracting common academic vocabulary from the texts I'm going to use) was easy, since I'd already written software to do that. All I needed to do then was eliminate the duplicate words, for which the obvious solution would be a little Perl script. But no, I couldn't be bothered to write Perl (largely because I haven't used it for years) and thought it would take less time to just open up a text editor and do find-replace. Silly Robin.