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_28 <-> q_28. t <-> q_2. ~q_2. ~q_28.
~q_2 and ~q_28 can be inferred via the conjunction rule. ~q_28 and ~q_2 can be inferred via the conjunction rule. p_28 -> q_28 can be inferred via the biconditional elimination rule. t -> q_2 can be inferred via the biconditional elimination rule. q_28 -> p_28 can be inferred via the biconditional elimination rule. q_2 -> t can be inferred via the biconditional elimination rule. ~p_28 can be inferred via the biconditional elimination rule. ~t can be inferred via the biconditional elimination rule.