I want to know the answer to the following question:
What is the name of the city-state that contains Bremen and Bremerhaven?
All the background I'm provided with is that "With an emphasis on geographical conditions, Berlin and Hamburg are frequently called Stadtstaaten (city-states), as is the Free Hanseatic City of Bremen, which in fact includes the cities of Bremen and Bremerhaven.". Is that enough to answer the question?