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: ~P(a_14). forall y_4: R_2(y_4) <-> P(y_4). q_3 -> r. ~R_2(a_14) -> r.
forall y_4: R_2(y_4) -> P(y_4) can be inferred via the universal biconditional elimination rule. forall y_4: P(y_4) -> R_2(y_4) can be inferred via the universal biconditional elimination rule.