What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_12: R_12(x_12) <-> S_12(x_12). s or ~R_12(a_12).
R_12(a_12) -> s. forall x_12: R_12(x_12) -> S_12(x_12). forall x_12: S_12(x_12) -> R_12(x_12).