What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists y: T_3(y) or ~U(y). forall y: U_2(y) -> R_1(y). forall y: R_1(y) -> U(y).
forall y: U_2(y) -> U(y). exists y: U(y) -> T_3(y).