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_14 or u. t_4. ~w_1. w_1 <-> q_14.
t_4 and ~w_1 can be inferred via the conjunction rule. ~w_1 and t_4 can be inferred via the conjunction rule. w_1 -> q_14 can be inferred via the biconditional elimination rule. q_14 -> w_1 can be inferred via the biconditional elimination rule. ~q_14 can be inferred via the biconditional elimination rule.