Thanks for the wide variety of comments and suggestions. At the clever suggestion from Brent London, I¹ve created (I hope) a Google Docs version of a recent revision. https://docs.google.com/document/d/1a_Agj-CLwM3E0CU-D2tKYCUPtPvNKKvIDKp3fle6 EQ8/edit?usp=sharing There have been some material changes from that originally distributed, so if you were Ok with the original, you may want to check this one out. And I hope I have made it possible for people to make comments. Please let me know if you¹re not able to do so. Thanks. Don