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Advent of Code is an annual Advent calendar of small programming puzzles for a variety of skill sets and skill levels that can be solved in any programming language you like.
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console.log('Hello World')
This map was really opaque until yEd helped explain the problem...
Very cool. It's interesting to see that all the loops are all crisscrosses until the last few before *Z. I guess that's how they ensured Z stayed at the end of the loop (by requiring RRRR and only having RRRR at the end of the instructions).
Nice, you can clearly see each input is going to loop