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: S_2(z_3) <-> U_2(z_3). exists z_3: S_2(z_3) or W(z_3). forall z_3: W(z_3) <-> U_2(z_3).
forall z_3: S_2(z_3) -> U_2(z_3) can be inferred via the universal biconditional elimination rule. forall z_3: W(z_3) -> U_2(z_3) can be inferred via the universal biconditional elimination rule. forall z_3: U_2(z_3) -> S_2(z_3) can be inferred via the universal biconditional elimination rule. forall z_3: U_2(z_3) -> W(z_3) can be inferred via the universal biconditional elimination rule.