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_23: U(x_23) <-> Q_3(x_23). exists x_23: T_1(x_23) <-> Q_23(x_23). forall x_23: ~Q_23(x_23). forall x_23: U(x_23) <-> T_1(x_23). forall x_23: P_3(x_23) -> Q_3(x_23).
forall x_23: U(x_23) -> Q_3(x_23) can be inferred via the universal biconditional elimination rule. forall x_23: U(x_23) -> T_1(x_23) can be inferred via the universal biconditional elimination rule. exists x_23: T_1(x_23) -> Q_23(x_23) can be inferred via the existential biconditional elimination rule. forall x_23: Q_3(x_23) -> U(x_23) can be inferred via the universal biconditional elimination rule. forall x_23: T_1(x_23) -> U(x_23) can be inferred via the universal biconditional elimination rule. exists x_23: Q_23(x_23) -> T_1(x_23) can be inferred via the existential biconditional elimination rule. exists x_23: ~T_1(x_23) can be inferred via the existential biconditional elimination rule.