What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall y: P(y) <-> R_1(y). forall y: R(y) -> S_3(y). forall y: R_1(y) -> R(y). exists y: S_3(y) -> Q_4(y).
forall y: R_1(y) -> S_3(y). exists y: R(y) -> Q_4(y). forall y: P(y) -> R_1(y). forall y: R_1(y) -> P(y).