What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall y_2: R_2(y_2) or ~R(y_2). forall y_2: T_4(y_2) -> S(y_2). exists y_2: R_2(y_2) -> T_4(y_2).
exists y_2: R_2(y_2) -> S(y_2). forall y_2: R(y_2) -> R_2(y_2).