I'm not quite sure either...but i think that you first just want to work with the edges that aren't in the wrong positions...lol, don't really know what the correct lingo on that is, but i'm sure you know what i mean. When you insert the edges down it will bring the bad edges up anyway, then you can use those. So i don't think that you should really ever have to bring an edge up before you can solve, just work with what you have and that will open new opportunities.