Notification of maintenance: In the next week we have to upgrade the servers due to increased demand. That may result in outages as we make the upgrades. Sorry for any inconvenience.
made a pass fixing some of the errors pointed out to me by readers.
chapter 7 will follow in a bit.
this will be the first time i try adding just a chapter. the previous posting was 1 large file. so fingers crossed i don't screw this up.