What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: forall z_3: T(z_3) -> S(z_3). exists z_3: W_2(z_3) <-> T(z_3).
exists z_3: W_2(z_3) -> T(z_3) can be inferred via the existential biconditional elimination rule. exists z_3: T(z_3) -> W_2(z_3) can be inferred via the existential biconditional elimination rule.