 What is a shear wall? You know, a shear wall basically keeps a building from racking from one side to the other. It gives us strength one way or the other. So if we're putting a shear wall in, many times what that is is we've got a wall that has plywood or OSB before it's finished, and there's a certain nailing pattern to keep that wall stiff so it doesn't rack from side to side. And that is going to be like the backbone wall.