“…258 One should agree with Kelsen that the norms of such content are senseless 259 and cannot be valid ("kann keine Geltung haben"). 261 Interestingly, as it seems one can observe here a common sense (and, therefore, somewhat necessary aspect, because common sense should not be an understated feature of only some of the jurisprudential conceptions) compliance of legal positivism with natural law doctrines-for example, Lon Fuller, in his procedural conception of natural law assumes the principle of impossibilium nulla est obligatio as one of the conditions of the internal morality of law. 261 Interestingly, as it seems one can observe here a common sense (and, therefore, somewhat necessary aspect, because common sense should not be an understated feature of only some of the jurisprudential conceptions) compliance of legal positivism with natural law doctrines-for example, Lon Fuller, in his procedural conception of natural law assumes the principle of impossibilium nulla est obligatio as one of the conditions of the internal morality of law.…”