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I just completed "Adapter Array" - Day 10 - Advent of Code 2020 adventofcode.com/2020/day/10 in .

* I was surprised to learn there's no "count unique values" function in base Julia (equivalent to `uniq -c` in shell). The `StatsBase` downloadable package is needed for that.
* How have I never used `sort` in Vim before?! I always thought I'd need to use the shell's sort command since that's the Unix-y way, but `:sort n` works like a charm.
* One thing Advent of Code does better than other coding challenges is state the problem very clearly. Good examples, clear question text, and every assumption made explicit.

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