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_11: R(x_11) -> ~U(x_11). forall x_11: R(x_11) <-> S(x_11). exists x_11: S(x_11) <-> T_4(x_11). forall x_11: U(x_11) and Q_11(x_11).
forall x_11: U(x_11) can be inferred via the universal simplification rule. forall x_11: Q_11(x_11) can be inferred via the universal simplification rule. forall x_11: R(x_11) -> S(x_11) can be inferred via the universal biconditional elimination rule. exists x_11: S(x_11) -> T_4(x_11) can be inferred via the existential biconditional elimination rule. forall x_11: S(x_11) -> R(x_11) can be inferred via the universal biconditional elimination rule. exists x_11: T_4(x_11) -> S(x_11) can be inferred via the existential biconditional elimination rule.