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_12 <-> q_3. t <-> q_12. q.
~t and q can be inferred via the conjunction rule. q and ~t can be inferred via the conjunction rule. q_12 -> q_3 can be inferred via the biconditional elimination rule. t -> q_12 can be inferred via the biconditional elimination rule. q_3 -> q_12 can be inferred via the biconditional elimination rule. q_12 -> t can be inferred via the biconditional elimination rule. ~q_12 can be inferred via the biconditional elimination rule.