The program, he was like the human optimizer, but he would use the program to quickly lay out the Tetris board of what things would look like. It turns out it takes a bit of time to make a rocket. So you got to think ahead. And my job there, sorry, that was like an amazing optimization problem because you've got this huge factory,. The rocket pieces have to be assembled in different areas, but also you've got to have the individual parts arrive on time.