code: public static List<Statement> getStatements(Nanopub nanopub) {
  		List<Statement> s = new ArrayList<>();
  		s.addAll(getSortedList(nanopub.getHead()));
  		s.addAll(getSortedList(nanopub.getAssertion()));
  		s.addAll(getSortedList(nanopub.getProvenance()));
  		s.addAll(getSortedList(nanopub.getPubinfo()));
  		return s;
  	}
docs: no instances allowed