What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_15: Q_15(x_15) or S_1(x_15). forall x_15: P_15(x_15) <-> Q_15(x_15). forall x_15: S(x_15) -> ~S_1(x_15). exists x_15: ~P_15(x_15).
forall x_15: P_15(x_15) -> Q_15(x_15). forall x_15: Q_15(x_15) -> P_15(x_15). exists x_15: ~Q_15(x_15).