Workflows in the automobile production line

1. One worker picks part #1 from rack #1 and places it on the welding cell.
2. Two workers pick part #2a from rack #2 and place it on the welding cell.
3. Two workers pick part #2b from rack #3 and place it on the welding cell.
4. A worker picks up parts #3a and #3b from rack #4 and places them on the welding cell.
5. A worker picks up part #4 from rack #1 and places it on the welding cell.
6. Two workers pick up part #5 from rack #5 and place it on the welding cell.
7. Welding: two workers grab the welding tools and weld the parts together.

Tasks can be permuted, however the execution order is statistically consistent.