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: R_17(a_17) <-> s. forall x_17: ~R_17(x_17). s or ~R_17(a_17).
R_17(a_17) -> s can be inferred via the rewriting rule. R_17(a_17) -> s can be inferred via the biconditional elimination rule. s -> R_17(a_17) can be inferred via the biconditional elimination rule.