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