struct Place {
  var name: String
  var population: Double
}

let places = [
  Place(name: "Lagos", population: 21.0),
  Place(name: "Cairo", population: 15.2),
  Place(name: "Kinshasa-Brazzaville", population: 11.3),
  Place(name: "Greater Johannesburg", population: 7.55),
  Place(name: "Mogadishu", population: 5.85),
  Place(name: "Khartoum-Omdurman", population: 4.98),
  Place(name: "Dar Es Salaam", population: 4.7),
  Place(name: "Alexandria", population: 4.58),
  Place(name: "Abidjan", population: 4.4),
  Place(name: "Casablanca", population: 3.98)
]