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_4 <-> t_4. ~t_4. p_4 or ~q.
q -> p_4 can be inferred via the rewriting rule. p_4 -> t_4 can be inferred via the biconditional elimination rule. t_4 -> p_4 can be inferred via the biconditional elimination rule. ~p_4 can be inferred via the biconditional elimination rule.