import java.util.NavigableSet;
import java.util.TreeSet;
public class Main {
public static void main(String[] args) {
String[] cities = { "A", "B", "C", "D", "E", "F" };
NavigableSet<String> citiesSet = new TreeSet<String>();
for (String city : cities)
citiesSet.add(city);
for (String city : citiesSet.descendingSet())
System.out.println(" " + city);
}
}
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