What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists z_1: R_1(z_1) <-> S(z_1). forall z_1: R_1(z_1) <-> W_2(z_1).
forall z_1: R_1(z_1) -> W_2(z_1). exists z_1: R_1(z_1) -> S(z_1). forall z_1: W_2(z_1) -> R_1(z_1). exists z_1: S(z_1) -> R_1(z_1).