What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_6: S(x_6) <-> P_3(x_6). forall x_6: P_6(x_6) or S(x_6). forall x_6: ~P_6(x_6).
forall x_6: S(x_6). forall x_6: S(x_6) -> P_3(x_6). forall x_6: P_3(x_6) -> S(x_6).