public static void Execute()
{
// Continent
var continent = new Continent("North America");
// Countries
var canada = new Country("Canada");
var usa = new Country("United States");
// Provinces
var quebec = new State("Quebec");
var ontario = new State("Ontario");
var florida = new State("Florida");
canada.AddBoundary(quebec);
canada.AddBoundary(ontario);
usa.AddBoundary(florida);
// Cities
quebec.AddBoundary(new City("Montreal"));
quebec.AddBoundary(new City("Quebec City"));
ontario.AddBoundary(new City("Toronto"));
ontario.AddBoundary(new City("Ottawa"));
florida.AddBoundary(new City("Orlando"));
continent.AddBoundary(canada);
continent.AddBoundary(usa);
continent.DisplayChilds(2);
}