Ha! I actually didn't know they could be defined locally, so that does help. Thanks! There really are a bunch of little things like this, like looping over s

Ha! I actually didn't know they could be defined locally, so that does help. Thanks! There really are a bunch of little things like this, like looping over subscripts, that would be nice as well. LuaTeX may make these easy, but, again, I've not had experience with it, so I'm not sure.