I like the ff => ff ligature that you've managed to paste from the .pdf. :) EDIT: I also made the mistake, but in their defence the between lists are used stra

I like the ff => ff ligature that you've managed to paste from the .pdf. :) EDIT: I also made the mistake, but in their defence the between lists are used straight away: They're printed. But the code seems to do three unrelated things in a row, so I'd expect an implementation like their one to have three separate function calls if there's no dependency between them.