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 x: W(x) -> P(x). ~W(c_4). ~P(c_4) -> s. forall x: P(x) -> W(x).
forall x: W(x) <-> P(x) can be inferred via the universal biconditional introduction rule. forall x: P(x) <-> W(x) can be inferred via the universal biconditional introduction rule.