What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? s -> P_15(a_12). forall x_15: P_15(x_15) <-> Q_15(x_15). Q_15(a_12) -> s.
Q_15(a_12) -> P_15(a_12). forall x_15: P_15(x_15) -> Q_15(x_15). forall x_15: Q_15(x_15) -> P_15(x_15).