Eric Wastl's talk
	https://www.youtube.com/watch?v=gibVyxpi-qA

mcpowers' tips
	https://gist.github.com/mcpower/87427528b9ba5cac6f0c679370789661

epsalon's Perl repo
	https://github.com/epsalon/advent_of_code

betaveros' howto
	https://blog.vero.site/post/advent-leaderboard
	https://www.youtube.com/watch?v=jls4zhEhlog

Vim:
	increment a visual block
	visual-block <number> g Ctrl-A (or Ctrl-X decrements)