What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? ~W(a_7). S(a_7) <-> u. forall z_3: S(z_3) <-> W(z_3).
S(a_7) -> u. u -> S(a_7). forall z_3: S(z_3) -> W(z_3). forall z_3: W(z_3) -> S(z_3).