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