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: ~W(e) -> w. ~S(e). forall x_4: W(x_4) <-> S(x_4).
forall x_4: W(x_4) -> S(x_4) can be inferred via the universal biconditional elimination rule. forall x_4: S(x_4) -> W(x_4) can be inferred via the universal biconditional elimination rule.