What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_6: Q_6(x_6) -> R_6(x_6). forall x_6: S(x_6) -> Q_6(x_6). r_1 -> S(f).
forall x_6: S(x_6) -> R_6(x_6).