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_12(a_12). R_12(a_12) <-> p. p <-> s.
R_12(a_12) -> p. p -> s. p -> R_12(a_12). s -> p. forall x_12: R_12(x_12) -> S_12(x_12). forall x_12: S_12(x_12) -> R_12(x_12).