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Introduction
Set basics
Relationships between sets
12. Using union()
Summary

## Instruction

Fantastic! We can use union() in a similar way:

kate_fav_movies = {'Halloween', 'A Star Is Born', 'Hocus Pocus'}
alan_fav_movies = {'A Star Is Born', 'The Lion King', 'Harry Potter'}
common_fav_movies = kate_fav_movies.union(alan_fav_movies)
print('Together, Alan and Kate like the following movies:', common_fav_movies)


The union() function creates a set that contains elements from both sets, as shown in the diagram:

You can also use this abbreviated notation:

kate_fav_movies | alan_fav_movies

## Exercise

XYC Corp. has some employees in cities A and B, as shown in the template code. Some of the employees work in both cities.

Your task is to create a union set from cities A and B and print the following sentence:

There are {x} employees in cities A and B.

Instead of {x}, provide the total number of unique employees in both cities.

Note: you can use len(set) to get the number of elements in a set.

### Stuck? Here's a hint!

Use:

len(city_a_employees.union(city_b_employees))