What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? ~R_11(a_11). forall x_11: R_11(x_11) <-> S_11(x_11). ~u. u or q_15.
q_15. ~R_11(a_11) and ~u. ~u and ~R_11(a_11). forall x_11: R_11(x_11) -> S_11(x_11). forall x_11: S_11(x_11) -> R_11(x_11).