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 -> p_17. p_17 <-> t. ~t.
p_17 -> t can be inferred via the biconditional elimination rule. t -> p_17 can be inferred via the biconditional elimination rule. ~p_17 can be inferred via the biconditional elimination rule.