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: p_13 <-> t_2. q_15. t_2.
q_15 and t_2 can be inferred via the conjunction rule. t_2 and q_15 can be inferred via the conjunction rule. p_13 -> t_2 can be inferred via the biconditional elimination rule. t_2 -> p_13 can be inferred via the biconditional elimination rule.