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: forall x_12: R_12(x_12) -> S_12(x_12). R_12(e) <-> S_12(e).
R_12(e) -> S_12(e) can be inferred via the biconditional elimination rule. S_12(e) -> R_12(e) can be inferred via the biconditional elimination rule.