What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall y_1: S_1(y_1) -> R(y_1). forall y_1: Q_2(y_1) <-> S_4(y_1). forall y_1: S_4(y_1) -> S_1(y_1). exists y_1: U_4(y_1) -> Q_2(y_1).
forall y_1: S_4(y_1) -> R(y_1). forall y_1: Q_2(y_1) -> S_4(y_1). forall y_1: S_4(y_1) -> Q_2(y_1).