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Question

https://sololearn.com/compiler-playground/cuSW0eLxRG0R/?ref=app

Answer 1

Attokurov Kanat Keep it single question that will help the community to understand your problem and you will get help.

https://www.sololearn.com/Discuss/3241622/?ref=app

Any code issues show your attempt.

Answer 2

Use intersect operator(&).
A & B => Returns values (in set) that are in both set A and B.
In this case, it'll return {'HTML'} as result, since it gets the value (in set) that are in both set skills and set job_skills.('HTML' is the only element that matches this condition)