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: s -> W(d). forall z: W(z) <-> S_4(z).
forall z: W(z) -> S_4(z) can be inferred via the universal biconditional elimination rule. forall z: S_4(z) -> W(z) can be inferred via the universal biconditional elimination rule.