What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: forall y_2: S(y_2) -> ~Q(y_2). exists y_2: ~U(y_2). forall y_2: U(y_2) or Q(y_2).
exists y_2: Q(y_2) can be inferred via the existential disjunctive syllogism rule.