Missing code after Exercise 5

[giorgi-tsu]

After exercise 5 this is what is written:

"There are many ways to get a list of unique numbers, and while you may be able to write a few lines of code using a for loop and another list (you should actually try doing it!), let's see how we can do this without a for loop and with a single line of code. This will bring us to the next data structure, sets."

There is a line code missing here, that was promised in the paragraph above.