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: ~u_3 -> t_3. ~q_17. s <-> q_17. u_3 -> s.
s -> q_17 can be inferred via the biconditional elimination rule. q_17 -> s can be inferred via the biconditional elimination rule. ~s can be inferred via the biconditional elimination rule.