What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists x_1: S(x_1) -> R_3(x_1). forall x_1: R_3(x_1) -> S(x_1).
exists x_1: S(x_1) <-> R_3(x_1). exists x_1: R_3(x_1) <-> S(x_1).