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_10(a_4) <-> s. forall x_10: ~R_10(x_10).
R_10(a_4) -> s can be inferred via the biconditional elimination rule. s -> R_10(a_4) can be inferred via the biconditional elimination rule.