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: P(x) -> Q(x). forall x: Q(x) -> W(x). exists x: W(x) <-> P(x).
forall x: P(x) -> W(x) can be inferred via the universal transitivity rule. exists x: W(x) -> P(x) can be inferred via the existential biconditional elimination rule. exists x: P(x) -> W(x) can be inferred via the existential biconditional elimination rule.