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_5 <-> t_1. ~p_5. r -> t_1. r or ~t_1.
t_1 -> r can be inferred via the rewriting rule. p_5 -> t_1 can be inferred via the biconditional elimination rule. t_1 -> p_5 can be inferred via the biconditional elimination rule. ~t_1 can be inferred via the biconditional elimination rule.