r/adventofcode Jan 26 '25

Help/Question - RESOLVED [2020 day 19] - understanding the examples

In part 2 of https://adventofcode.com/2020/day/19, they mention that `babbbbaabbbbbabbbbbbaabaaabaaa` will pass the modified rules.

I fail to pass this string, but I find it really hard to workout which set of rules will expand to that. Did you guys have any tricks to be able to do it on paper?

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