code: @Override
  	public void fill(T from, T to) {
  		ExtendedSet<T> toAdd = empty();
  		toAdd.add(to);
  		toAdd.complement();
  		toAdd.add(to);
  
  		ExtendedSet<T> toRemove = empty();
  		toRemove.add(from);
  		toRemove.complement();
  		
  		toAdd.removeAll(toRemove);
  		
  		this.addAll(toAdd);
  	}
docs: {@inheritDoc}