What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x: P(x) -> W(x). forall x: W(x) -> R(x). forall x: P(x) or T(x). exists x: T(x) <-> R(x).
forall x: P(x) -> R(x). exists x: T(x) -> R(x). exists x: R(x) -> T(x).