What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: forall y_2: ~T(y_2). T(a_5) <-> q.
T(a_5) -> q can be inferred via the biconditional elimination rule. q -> T(a_5) can be inferred via the biconditional elimination rule.