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import java.util.SortedSet;
import java.util.TreeSet;
public class Main {
public static void main(String[] args) {
TreeSet<String> tSet = new TreeSet<String>();
tSet.add("1");
tSet.add("2");
tSet.add("3");
tSet.add("4");
tSet.add("5");
SortedSet sortedSet = tSet.headSet("3");
System.out.println("Head Set Contains : " + sortedSet);
}
}
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