What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_5: Q_13(x_5) -> S_5(x_5). forall x_13: P_13(x_13) <-> Q_13(x_13). forall x_13: P_13(x_13) or Q_10(x_13). forall x_13: Q_10(x_13) -> Q_13(x_13).
forall x_13: P_13(x_13) -> Q_13(x_13). forall x_13: Q_13(x_13) -> P_13(x_13).