What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z_1: Q(z_1) <-> W(z_1). forall z_1: Q(z_1) and U_1(z_1).
forall z_1: Q(z_1). forall z_1: U_1(z_1). forall z_1: Q(z_1) -> W(z_1). forall z_1: W(z_1) -> Q(z_1).