What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_6: P_6(x_6) <-> Q_6(x_6). forall x_6: P_6(x_6) -> S_3(x_6). forall x_6: ~Q_6(x_6). exists x_6: S_3(x_6) -> P_6(x_6).
exists x_6: S_3(x_6) <-> P_6(x_6). exists x_6: P_6(x_6) <-> S_3(x_6). forall x_6: P_6(x_6) -> Q_6(x_6). forall x_6: Q_6(x_6) -> P_6(x_6). forall x_6: ~P_6(x_6).