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) <-> U_1(x). forall x: U_1(x) -> Q_3(x). exists x: P(x) -> W(x). forall x: W(x) -> P(x). forall x: ~Q_3(x).
forall x: ~U_1(x). exists x: P(x) <-> W(x). exists x: W(x) <-> P(x). forall x: P(x) -> U_1(x). forall x: U_1(x) -> P(x).