public NavigableSet<K> descendingKeySet() {return new BoundedMap(!ascending, from, fromBound, to, toBound).navigableKeySet();}
public java.util.NavigableSet<K> descendingKeySet(){return new java.util.TreeMap<K, V>.BoundedMap(this._enclosing, !this.ascending, this.from, this.fromBound, this.to, this.toBound).navigableKeySet();}