That is a big and complex code. If you take problems like...

That is a big and complex code. If you take problems like finding the optimal shape for common automotive and aircraft structures, you have to somehow find the shape that has the least weight but at the same time won't break. We call that process shape optimization or topology optimization. These shapes have holes in them for bolting them in place or to reduce their weight. You have to decide whether to have one hole or two holes or 10 holes in a part, exactly where to put those holes and how to shape the holes.