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_12: P_12(x_12) -> ~Q_12(x_12). q_2 <-> P_12(a_10). forall x_12: Q_12(x_12).
q_2 -> P_12(a_10) can be inferred via the biconditional elimination rule. P_12(a_10) -> q_2 can be inferred via the biconditional elimination rule. forall x_12: ~P_12(x_12) can be inferred via the universal modus tollens rule.