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: q_12 <-> t_4. ~w. w <-> q_12.
q_12 -> t_4 can be inferred via the biconditional elimination rule. w -> q_12 can be inferred via the biconditional elimination rule. t_4 -> q_12 can be inferred via the biconditional elimination rule. q_12 -> w can be inferred via the biconditional elimination rule. ~q_12 can be inferred via the biconditional elimination rule.