Remarkable how productive one can be when the internet is broken.
My thinking for exercise 2A (which is based on R1 and R2) is to build a SLOC counter using LPeg and Leg. This exposes what is to me a hole in the PSP 0.1. How does one account for researching time? Does it go under Design? In a more elaborate PSP I can only imagine that it deserve its own heading.