What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? T_1(c_4) or ~U(c_4). forall y: U(y) -> T_1(y). forall y: T_1(y) -> U(y).
U(c_4) -> T_1(c_4). forall y: U(y) <-> T_1(y). forall y: T_1(y) <-> U(y).