public override OrderedBidiMap inverseOrderedBidiMap()
 {
     if (inverse == null)
     {
         inverse         = new UnmodifiableOrderedBidiMap(getOrderedBidiMap().inverseOrderedBidiMap());
         inverse.inverse = this;
     }
     return(inverse);
 }
 public override OrderedBidiMap inverseOrderedBidiMap()
 {
     if (inverse == null)
     {
         inverse = new UnmodifiableOrderedBidiMap(getOrderedBidiMap().inverseOrderedBidiMap());
         inverse.inverse = this;
     }
     return inverse;
 }