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_4 <-> S(a_14). forall z: ~S(z).
w_4 -> S(a_14) can be inferred via the biconditional elimination rule. S(a_14) -> w_4 can be inferred via the biconditional elimination rule.