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: exists x_8: S(x_8) <-> Q(x_8). forall x_8: P_2(x_8) or ~Q(x_8).
forall x_8: Q(x_8) -> P_2(x_8) can be inferred via the universal rewriting rule. exists x_8: S(x_8) -> Q(x_8) can be inferred via the existential biconditional elimination rule. exists x_8: Q(x_8) -> S(x_8) can be inferred via the existential biconditional elimination rule.