What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: forall x_8: ~R_8(x_8). s or R_8(a_8). ~s or u.
R_8(a_8) or u can be inferred via the resolution rule. R_1(a_8) -> s can be inferred via the rewriting rule.