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 z: Q(z) -> T_2(z). t <-> T_2(a_10).
t -> T_2(a_10) can be inferred via the biconditional elimination rule. T_2(a_10) -> t can be inferred via the biconditional elimination rule.