NLSSubstitution.setPrefix("");
refac.setPrefix("");
	private NLSRefactoring prepareRefac(ICompilationUnit cu) {		NLSRefactoring refac= NLSRefactoring.create(cu);		NLSSubstitution[] subs= refac.getSubstitutions();		NLSSubstitution.setPrefix("");		for (int i= 0; i < subs.length; i++) {			subs[i].setState(NLSSubstitution.EXTERNALIZED);			subs[i].generateKey(subs);		}		fillInValues(refac);		return refac;	}