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) -> U_3(y). forall y: S_1(y) -> P(y). forall y: U_3(y) -> S_1(y). exists y: P(y) or Q_3(y). forall y: ~S_1(y).
forall y: ~U_3(y). forall y: P(y) -> S_1(y). forall y: S_1(y) -> U_3(y). forall y: U_3(y) -> P(y).