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import java.util.Iterator;
import java.util.TreeSet;
public class Main {
public static void main(String[] args) {
TreeSet<Integer> tSet = new TreeSet<Integer>();
tSet.add(new Integer("1"));
tSet.add(new Integer("2"));
tSet.add(new Integer("3"));
Iterator itr = tSet.iterator();
while (itr.hasNext()){
System.out.println(itr.next());
}
}
}
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