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: t_2 -> t_3. t_3 <-> t_2. ~t_3. t_2 or q.
~t_2 can be inferred via the modus tollens rule. t_3 -> t_2 can be inferred via the biconditional elimination rule. t_2 -> t_3 can be inferred via the biconditional elimination rule. ~t_2 can be inferred via the biconditional elimination rule.