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_2: R(z_2) <-> S_3(z_2). forall z_2: R(z_2) or W_2(z_2). exists z_2: S_3(z_2) or ~W_2(z_2).
exists z_2: W_2(z_2) -> S_3(z_2) can be inferred via the existential rewriting rule. forall z_2: R(z_2) -> S_3(z_2) can be inferred via the universal biconditional elimination rule. forall z_2: S_3(z_2) -> R(z_2) can be inferred via the universal biconditional elimination rule.