Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE city (city VARCHAR, regional_population INTEGER)
### Question:
Please give me a list of cities whose regional population is over 8000000 or under 5000000.
### Answer:
SELECT city FROM city WHERE regional_population > 10000000 UNION SELECT city FROM city WHERE regional_population < 5000000