code: private static Model excise(Set<BioPAXElement> result)
  	{
  		Completer c = new Completer(EM);
  		result = c.complete(result);
  		Cloner cln = new Cloner(EM, BioPAXLevel.L3.getDefaultFactory());
  		return cln.clone(result);
  	}
docs: Excises a model to the given elements.
  @param result elements to excise to
  @return excised model