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: ~S(y). exists y: R_2(y) -> P(y). forall y: P(y) -> S(y). forall y: R_2(y) or W(y).
forall y: ~P(y) can be inferred via the universal modus tollens rule. exists y: R_2(y) -> S(y) can be inferred via the existential transitivity rule.