Each city is in a unique country. Data about cities include the name of the city

and its population. Names of cities are unique within countries, but two cities in

different countries may have the same name (and possibly even the same

population).

Information about a country includes its name and its head of state. You may

assume no two countries have the same name.

Information about a consulate includes its name, which is unique (e.g.,

"consulate of the United States in Toronto") and its street address (which is

unique within a city, but might not be unique among all consulates in different

cities).

Cities and the country they are in are related by a relationship In.

Consulates and the city in which each is located are related by a

relationship Location.

Countries and consulates are related by a representation Represents. Each

country represented by a consulate has a consul, who is represented only by a

name. A subtle point is that occasionally, a consulate will represent more that

one country. For example, country A may not have diplomatic relations with

country B, so A will ask country C to represent A's interests in country B at

their own consultates. In that case, the consul for country A is actually a citizen

of country C, and that person will likely not be the same as the consul for

country C at the same consulate.

While you might assume that a country would have at most one consulate in a

given city, that is not always the case. For example, the US retains two

consulates in Jerusalem.