This course is extraordinary! Thank you, John! I know what it means to run such a lectures. You spent a lot of energy in a selfless manner.
If I understand correctly, the course is temporarily over. I was especially looking forward to the next chapter, where diagrams are understood as morphisms between their input and output sets. I deal a lot with Causal Loop Diagrams (CLD) that explicitly have no input and no output sets and only consist of loops. Therefore, the view of seeing a diagram as a morphism between two sets can not quite satisfy me. I would like to have discussed this in the lessons to the next chapter.
But maybe I can find answers elsewhere in your very rich offers.
Thanks once again. It was fun!