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_14: ~R_14(x_14). p_2 -> r_4. r_4 <-> R_14(b_3).
r_4 -> R_14(b_3) can be inferred via the biconditional elimination rule. R_14(b_3) -> r_4 can be inferred via the biconditional elimination rule.