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 <-> q_15. q_2. ~q_15. p_10 <-> t.
q_2 and ~q_15 can be inferred via the conjunction rule. ~q_15 and q_2 can be inferred via the conjunction rule. t -> q_15 can be inferred via the biconditional elimination rule. p_10 -> t can be inferred via the biconditional elimination rule. q_15 -> t can be inferred via the biconditional elimination rule. t -> p_10 can be inferred via the biconditional elimination rule. ~t can be inferred via the biconditional elimination rule.