# Create list
countries = ['United States', 'Canada', 'Mexico']


# Add country at the end
countries.append('Ireland')


# Remove by index
del(countries[3])


# Add a country in the middle
countries.insert(2, 'United Kingdom',)
countries.insert(3, 'Mali',)

print(countries)


# Create set
country_set = {'United States', 'Canada', 'Mexico'}


# Add country
country_set.add('Ireland')


# Remove
country_set.remove('Canada')
print(country_set)
