What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_12: Q(x_12) <-> S_12(x_12). Q(a_12) <-> q_3. ~S_12(a_12). q_3 <-> u.
Q(a_12) -> q_3. q_3 -> u. q_3 -> Q(a_12). u -> q_3. forall x_12: Q(x_12) -> S_12(x_12). forall x_12: S_12(x_12) -> Q(x_12).