import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;
public class Main {
public static void main(String[] a) {
List<String> list = new LinkedList<String>();
list.add("A");
list.add("B");
list.add("C");
list.add("D");
ListIterator iter = list.listIterator();
while (iter.hasNext()) {
System.out.println(iter.next());
}
}
}
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