public void SimpleEquality()
{
// (a <=> b) ----> (a ∨ !b) ∧ (b ∨ !a)
var T = CNFify.equal(a, b);
var result = CNFify.normalize(T);
var expected = CNFify.Term.NewAnd(
CNFify.Term.NewOr(CNFify.Term.NewNot(a), b),
CNFify.Term.NewOr(CNFify.Term.NewNot(b), a)
);
Assert.AreEqual(expected, result);
}