[url=https://en.wikipedia.org/wiki/Power_set#:~:text=In%20mathematics%2C%20the%20power%20set,of%20two%20elements%2C%202S.]https://en.wikipedia.org/wiki/Power_set#:~:text=In%20mathematics%2C%20the%20power%20set,of%20two%20elements%2C%202S.[/url]