static <A, B> IterableIterator<B> valuesOfMagicMap(Map<A, B> map) {
  final Iterator<A> i = keys(map);
  ret new IterableIterator<B> {
    public bool hasNext() {
      ret i.hasNext();
    }
  
    public B next() {
      ret map.get(i.next());
    }
    
    public void remove() {
      i.remove();
    }
  };
}