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 <-> w_3. t <-> q_12.
q_12 -> w_3 can be inferred via the biconditional elimination rule. t -> q_12 can be inferred via the biconditional elimination rule. w_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.