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). w_1 -> S_12(a_12). w_1 <-> u. ~R_12(a_12).
w_1 -> u. u -> w_1. forall x_12: R_12(x_12) -> S_12(x_12). forall x_12: S_12(x_12) -> R_12(x_12).