Regular Languages Are Closed Under 'Avoids' – Example from Sipser 1.70 📚

Here we give an example of the fact that regular languages are closed under "avoids". The main video proving this is here: https://www.youtube.com/watch?v=y86jpV5tn_0

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▶ADDITIONAL QUESTIONS◀
1. Are there other interesting examples?

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▶ABOUT ME◀
I am a professor of Computer Science, and am passionate about CS theory. I have taught over 12 courses at two different universities, including several sections of undergraduate and graduate theory-level classes.