public NavigableSet<E> descendingSet() {return (descendingSet != null) ? descendingSet: (descendingSet = new TreeSet<E>(backingMap.descendingMap()));}
public virtual java.util.NavigableSet<E> descendingSet(){return (_descendingSet != null) ? _descendingSet : (_descendingSet = new java.util.TreeSet<E>(backingMap.descendingMap()));}