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