import java.util.ConcurrentModificationException;
import java.util.Iterator;
import java.util.Set;

/**
 * @author shinsuke
 *
 */
public class LruHashSet<E> extends AbstractSet<E> implements Set<E>, java.io.Serializable {
    private static final long serialVersionUID = 1L;

    private final LruHashMap<E, Object> map;

    // Dummy value to associate with an Object in the backing Map