What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_7: R_7(x_7) <-> P_8(x_7). forall x_8: P_8(x_8).
forall x_7: R_7(x_7) -> P_8(x_7). forall x_7: P_8(x_7) -> R_7(x_7).