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: ~s. s <-> q_8. t <-> q_8.
s -> q_8 can be inferred via the biconditional elimination rule. t -> q_8 can be inferred via the biconditional elimination rule. q_8 -> s can be inferred via the biconditional elimination rule. q_8 -> t can be inferred via the biconditional elimination rule. ~q_8 can be inferred via the biconditional elimination rule.