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: ~P(y_2). exists y_2: W(y_2) -> P(y_2). forall y_2: Q(y_2) -> W(y_2).
exists y_2: ~W(y_2) can be inferred via the existential modus tollens rule. exists y_2: Q(y_2) -> P(y_2) can be inferred via the existential transitivity rule.