What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z_1: W(z_1) -> Q_2(z_1). exists z_1: W(z_1) -> U_4(z_1). forall z_1: U_4(z_1) -> Q_2(z_1). forall z_1: Q_2(z_1) -> W(z_1).
forall z_1: U_4(z_1) -> W(z_1). exists z_1: W(z_1) -> Q_2(z_1). exists z_1: Q_2(z_1) -> U_4(z_1). forall z_1: W(z_1) <-> Q_2(z_1). forall z_1: Q_2(z_1) <-> W(z_1).