What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists x_6: P_6(x_6). forall x_6: P_6(x_6) -> S_3(x_6). forall x_6: ~S_3(x_6) or R(x_6).
exists x_6: S_3(x_6).