SEO - Routing with 2 segments: /parent/alias

With /parent/alias, SEF URLs consists in 2 human-readable segments, where the 1st one refers to the parent content.

CityCountryPopulation
Brasilia
Brazil
2.563 million
Cape Town
South Africa
3.740 million
Johannesburg
South Africa
4.435 million
London
United Kingdom
8.174 million
Moscow
Russia
11.980 million
Naples
Italy
0.000 million
New York City
United States
8.245 million
Paris
France
2.234 million
Rome
Italy
2.778 million
Sao Paulo
Brazil
11.320 million
Washington, D.C.
United States
0.633 million