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_3(z_4). exists z_4: R(z_4) or T(z_4). forall z_4: R(z_4) -> P(z_4). forall z_4: T(z_4) -> P(z_4).
exists z_4: P(z_4).