i've got 2 set of strings, but only 4 of the set... hope that makes sence. I was thinking I was just going to restring 4 of them beacuse I've got to do a little live performance tonight. My question is... I have a .012, .016, .042, .045, .032, and a .035. Which strings are these? Its for an acoustic guitar and they are Elixir ultra thin.