Way back in [32] Pokemon Chiao, Raku, my answer to the Perl Weekly Challenge #25, I name dropped Euler and his Seven 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
• [81.5] Part 5: Paris Metro (Published 25. August 2020)