What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? ~q or u. forall x: R_4(x) -> T(x). u <-> T(a_13). q or R_4(a_13).
R_4(a_13) or u. R_1(a_13) -> q. u -> T(a_13). T(a_13) -> u.