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: u -> p. ~t_3. t_3 <-> p. q_2.
~t_3 and q_2 can be inferred via the conjunction rule. q_2 and ~t_3 can be inferred via the conjunction rule. t_3 -> p can be inferred via the biconditional elimination rule. p -> t_3 can be inferred via the biconditional elimination rule. ~p can be inferred via the biconditional elimination rule.