What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z_2: S_4(z_2) or ~U_1(z_2). exists z_2: S_4(z_2) <-> P(z_2). forall z_2: U_1(z_2) or P(z_2).
forall z_2: U_1(z_2) -> S_4(z_2). exists z_2: S_4(z_2) -> P(z_2). exists z_2: P(z_2) -> S_4(z_2).