COND clauses are of the form (sentence term).
(=> (Variables-In-Cond-Clause ?Cond-Clause ?Vset) (And (List ?Cond-Clause) (Sentence (First ?Cond-Clause)) (Term (Second-Item ?Cond-Clause)) (= ?Vset (Union (Variables-In-Sentence (First ?Cond-Clause)) (Variables-In-Term (Second-Item ?Cond-Clause))))))