We're getting into the part of 2021 where data structures really matter, and it's a fun thing to consider – most day to day programming problems aren't this obviously about that.

Anyway, here's my (commented) solution for Day 5:

It's not super performant, but good enough. I'm pretty sure at least part of it is due to Data.Map being an ordered Map, when I don't really need it to be.

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