What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? t_3 -> p_1. p_1 -> t_3. ~p_9. p_9 <-> p_1.
t_3 <-> p_1. p_1 <-> t_3. p_9 -> p_1. p_1 -> p_9. ~p_1.