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_3. q or t_4. p. t_4 <-> q_3. ~q or r.
~q_3 and p can be inferred via the conjunction rule. p and ~q_3 can be inferred via the conjunction rule. t_4 or r can be inferred via the resolution rule. t_4 -> q_3 can be inferred via the biconditional elimination rule. q_3 -> t_4 can be inferred via the biconditional elimination rule. ~t_4 can be inferred via the biconditional elimination rule.