protected DescendingKeySetImpl(AbstractWrapperXOrderedMap<K, V> parentMap) {
   super(parentMap, OrderedMapViewInfos.descendingKeySet());
 }
 protected LastEntryImpl(AbstractWrapperXOrderedMap<K, V> parentMap) throws NoEntryException {
   super(parentMap, OrderedMapViewInfos.lastEntry());
 }
 protected DescendingMapImpl(AbstractWrapperXOrderedMap<K, V> parent) {
   super(parent, OrderedMapViewInfos.descendingMap());
 }