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 y: Q(y). forall y: W(y) -> R(y). forall y: W(y) -> ~Q(y). exists y: R(y) -> W(y).
forall y: ~W(y) can be inferred via the universal modus tollens rule. exists y: R(y) <-> W(y) can be inferred via the existential biconditional introduction rule. exists y: W(y) <-> R(y) can be inferred via the existential biconditional introduction rule.