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_7: T(x_7) <-> Q_7(x_7). forall x_7: Q_7(x_7) -> U_2(x_7). forall x_7: U_2(x_7) -> R(x_7).
forall x_7: Q_7(x_7) -> R(x_7) can be inferred via the universal transitivity rule. forall x_7: T(x_7) -> Q_7(x_7) can be inferred via the universal biconditional elimination rule. forall x_7: Q_7(x_7) -> T(x_7) can be inferred via the universal biconditional elimination rule.