What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall y_3: Q_1(y_3) <-> U_1(y_3). forall y_3: P(y_3). exists y_3: Q_1(y_3) -> ~P(y_3).
exists y_3: ~Q_1(y_3). forall y_3: Q_1(y_3) -> U_1(y_3). forall y_3: U_1(y_3) -> Q_1(y_3).