What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: forall x_7: P_7(x_7) -> ~Q_7(x_7). forall x_7: Q_7(x_7). s <-> P_7(a_5).
s -> P_7(a_5) can be inferred via the biconditional elimination rule. P_7(a_5) -> s can be inferred via the biconditional elimination rule. forall x_7: ~P_7(x_7) can be inferred via the universal modus tollens rule.