What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x: Q(x) -> P_4(x). forall x: P_4(x) -> Q(x). forall x: ~P_4(x). exists x: Q(x) <-> P_4(x).
forall x: ~Q(x). forall x: Q(x) <-> P_4(x). forall x: P_4(x) <-> Q(x). exists x: Q(x) -> P_4(x). exists x: P_4(x) -> Q(x). exists x: ~Q(x).