What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z_4: U_3(z_4) or U(z_4). forall z_4: P_2(z_4) -> S_4(z_4). forall z_4: U(z_4) -> S_4(z_4). forall z_4: U_3(z_4) <-> P_2(z_4).
forall z_4: U_3(z_4) -> P_2(z_4). forall z_4: P_2(z_4) -> U_3(z_4).