If you have more than nine things in a file, it's always a good idea to do the 01, 02, 03. If I ever go above nine assignments or links within a given module, my numbers aren't going to line up very well. By the time you get to 10, if you haven't done the 01,02, then 10 is going to be right underneath one. It's going to go one, 10, two, et cetera. And so having those extra digits in there can help with that kind of thing.