Way back in  Pokemon Chiao, Raku, my answer to
Weekly Challenge #25, I name dropped Euler and his
Bridges of Königsberg.
Now the time has come for doing something about those bridges, so to speak...
This article has been divided into these parts:
• [81.1] Part 1: Königsberg
• [81.2] Part 2: Euler
• [81.3] Part 3: Hamilton
• [81.4] Part 4: Executive Order
It would have been neat to have seven parts, but I ran out of ideas.
I am open for ideas, though...