What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_20: Q_15(x_20) or P_20(x_20). forall x_20: P_1(x_20). forall x_20: P_20(x_20) <-> Q_20(x_20). forall x_20: Q_20(x_20) or ~Q_15(x_20). exists x_20: Q_20(x_20) -> Q_2(x_20).
forall x_20: Q_15(x_20) -> Q_20(x_20). forall x_20: P_20(x_20) -> Q_20(x_20). forall x_20: Q_20(x_20) -> P_20(x_20).