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))))))