use std::collections::HashMap;

​

fn main() {

  let mut capitalCities = HashMap::new();

​

  // Add keys and values (Country, City)

  capitalCities.insert("England", "London");

  capitalCities.insert("Germany", "Berlin");

  capitalCities.insert("Norway", "Oslo");

​

  // Remove the key "England"

  capitalCities.remove("England");

​

  println!("{:?}", capitalCities);

}