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