Day 08-12 #adventofcode

Here are the remaining 5 days' solution write-ups. These are the Unison docs, which I have straightaway copied and pasted here. Each page includes a link to the original post, which renders much better with links to code, etc.

I learnt a lot by thinking and solving this year's puzzles. It was a mixed bag, but a good mental exercise to end the year, nevertheless.