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). forall y: U(y) <-> W(y). forall y: P(y) <-> Q_1(y). exists y: U(y) -> Q_1(y).
forall y: U(y) -> W(y). forall y: P(y) -> Q_1(y). forall y: W(y) -> U(y). forall y: Q_1(y) -> P(y). forall y: ~Q_1(y).