What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? ~w_4. forall x_12: P(x_12) <-> S_12(x_12). w_4 or ~P(a_12).
~P(a_12). P(a_12) -> w_4. forall x_12: P(x_12) -> S_12(x_12). forall x_12: S_12(x_12) -> P(x_12).