 So there's a zigzag pattern. And then basically you take the ultimate width, you divide it in half, and that's how many. Anyway, I don't have time to describe it here, but take a picture, a quick measurement. We can help you design this stuff so you get enough, the right quantity, so it accomplishes what you want. Frequently you need one more plant. So I'm telling you right now. Pay the extra hundred bucks, get the big one.