What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? s. P_17(a_16) or t_3. t_3 -> Q_17(a_16). forall x_17: P_17(x_17) -> Q_17(x_17). forall x_17: Q_17(x_17) -> P_17(x_17).
forall x_17: P_17(x_17) <-> Q_17(x_17). forall x_17: Q_17(x_17) <-> P_17(x_17).