What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z_4: P_1(z_4) -> Q_1(z_4). forall z_4: Q_1(z_4) -> P_1(z_4). forall z_4: P_1(z_4) or P(z_4). exists z_4: P(z_4) -> Q_1(z_4).
exists z_4: P(z_4) -> P_1(z_4). exists z_4: Q_1(z_4). forall z_4: P_1(z_4) <-> Q_1(z_4). forall z_4: Q_1(z_4) <-> P_1(z_4).