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. u_2. p <-> w_4. q_12.
~p and u_2 can be inferred via the conjunction rule. ~p and q_12 can be inferred via the conjunction rule. u_2 and ~p can be inferred via the conjunction rule. u_2 and q_12 can be inferred via the conjunction rule. q_12 and ~p can be inferred via the conjunction rule. q_12 and u_2 can be inferred via the conjunction rule. p -> w_4 can be inferred via the biconditional elimination rule. w_4 -> p can be inferred via the biconditional elimination rule. ~w_4 can be inferred via the biconditional elimination rule.