What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_18: T(x_18) <-> S_18(x_18). S_18(j_4) <-> t. u. ~t.
u and ~t. ~t and u. S_18(j_4) -> t. t -> S_18(j_4). ~S_18(j_4). forall x_18: T(x_18) -> S_18(x_18). forall x_18: S_18(x_18) -> T(x_18).