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: exists x: Q(x) -> W_4(x). forall x: W_4(x) -> Q(x). forall x: Q(x) and T(x).
forall x: Q(x) can be inferred via the universal simplification rule. forall x: T(x) can be inferred via the universal simplification rule. exists x: Q(x) <-> W_4(x) can be inferred via the existential biconditional introduction rule. exists x: W_4(x) <-> Q(x) can be inferred via the existential biconditional introduction rule.