code: public void removeManagedList( List<Span> spans ){
  		final Span listIdentifer = new Span(Integer.MAX_VALUE, Integer.MIN_VALUE);	
  		spans.add( listIdentifer );	
  		managedLists.remove( spans );
  		spans.remove( listIdentifer );
  	}
docs: Removes a List of Spans (not the Spans in the List), which shouldn�t be managed anymore.
  @param spans