Advent of Code 2021, 1968 style

Can you use a historical programming language to solve modern programming puzzles?

Let's use the most modern, most ambitious, most elegant, most controversial, most hated, and most significant flop of a language ever: ALGOL 68.

This requires Algol68Genie, by Marcel van der Veer:

https://jmvdveer.home.xs4all.nl/en.algol-68-genie.html

Some recent background material:

https://accu.org/journals/overload/26/148/james_2586/

https://opensource.com/article/20/6/algol68