What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? T_1(d_2) <-> T(d_2). ~T_1(d_2). forall y: T_1(y) -> T(y).
T_1(d_2) -> T(d_2). T(d_2) -> T_1(d_2).