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_9. t <-> q_14. p_9 <-> q_9. t -> p_9.
t -> q_14 can be inferred via the biconditional elimination rule. p_9 -> q_9 can be inferred via the biconditional elimination rule. q_14 -> t can be inferred via the biconditional elimination rule. q_9 -> p_9 can be inferred via the biconditional elimination rule. ~p_9 can be inferred via the biconditional elimination rule.