What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall y: U(y) -> U_2(y). forall y: T_1(y) <-> Q_4(y). exists y: U_2(y) -> U(y). forall y: T_1(y) -> U_2(y). forall y: U(y) or Q_4(y).
exists y: T_1(y) -> U(y). exists y: U_2(y) <-> U(y). exists y: U(y) <-> U_2(y). forall y: T_1(y) -> Q_4(y). forall y: Q_4(y) -> T_1(y).