Normally I would full send my first solve (which had 424 cycles), but I had extra time this week so I tried multiple layouts and executions to try to get ahead of the pileup.

In this layout, the loose atoms form a stack. We would like to pop alternating tin and lead off the top to make outputs, and accumulate silver waste at the bottom. This requires re-ordering atoms on the stack, which we do three times, on cycles 86, 246, and 316.