Most Common Non$-$Stop Words

Create a markdown cell with a level $2$ header that reads "Most Common Non$-$Stop Words". Add unformatted text

explaining that you will display the $20$ most commonly occurring non$-$stop words.

Use the function find$\_$frequency $()$ with the list words$\_$ns to create a dictionary of word counts for the non$-$stop

words. Store the result in a variable named freq$\_$ns$.$ Then use most$\_$common$()$ to display the $20$ most commonly$-$

occurring non$-$stop words in the novel.