importhtml google sheets multiple tables
=UNIQUE({
IMPORTHTML("https://en.wikipedia.org/wiki/List_of_Seinfeld_episodes","table",3);
IMPORTHTML("https://en.wikipedia.org/wiki/List_of_Seinfeld_episodes","table",4);
IMPORTHTML("https://en.wikipedia.org/wiki/List_of_Seinfeld_episodes","table",5);
IMPORTHTML("https://en.wikipedia.org/wiki/List_of_Seinfeld_episodes","table",6);
IMPORTHTML("https://en.wikipedia.org/wiki/List_of_Seinfeld_episodes","table",7);
IMPORTHTML("https://en.wikipedia.org/wiki/List_of_Seinfeld_episodes","table",8);
IMPORTHTML("https://en.wikipedia.org/wiki/List_of_Seinfeld_episodes","table",9);
IMPORTHTML("https://en.wikipedia.org/wiki/List_of_Seinfeld_episodes","table",10)
})