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_9(e) -> q. q -> S_9(e). forall x_9: S(x_9) <-> S_9(x_9). ~S(e).
forall x_9: S(x_9) -> S_9(x_9) can be inferred via the universal biconditional elimination rule. forall x_9: S_9(x_9) -> S(x_9) can be inferred via the universal biconditional elimination rule.