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_10: R_10(x_10) -> S_10(x_10). R_10(b_4) <-> S_10(b_4).
R_10(b_4) -> S_10(b_4) can be inferred via the biconditional elimination rule. S_10(b_4) -> R_10(b_4) can be inferred via the biconditional elimination rule.