public static boolean isomorphic(DefaultRule a, DefaultRule b) {
a = preprocess(a);
b = preprocess(b);
Matching m = new Matching();
Clause ca = new Clause(Sugar.iterable(a.antecedent().literals(), a.consequent().literals()));
Clause cb = new Clause(Sugar.iterable(b.antecedent().literals(), b.consequent().literals()));
return ca.variables().size() == cb.variables().size()
&& ca.literals().size() == cb.literals().size()
&& m.isomorphism(ca, cb);
}
