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Now I wonder what artifacts should be there for this to count as a successful kata/exercise.
Should I be able to reproduce it from scratch now? Teach how to do it?
Publish some packages?
Blog about how silly it is to use C++ for teaching stuff?
Take some jabs at course material (some quirks survived into v4.0 of it)?
So many options, so little time... What should have best return on time invested? 
@tristanC Dumped everything salient I could remember about the experience
@dpwiz A companion post can be pretty valuable, do you have a blog already?