56As noted by the Advocate General in points 60 and 61 of his Opinion, although Directive 2009/72 has not introduced an exhaustive harmonisation of the areas governed by it, the concepts of transmission system and distribution system, within the meaning of that directive, play a fundamental role in the scheme thereof in so far as, in order to bring about completion of the internal market in electricity, the directive, as follows from the provisions in Chapters IV to VI thereof and as already pointed out in paragraph 42 above, (i) requires an effective legal and functional separation of those systems and (ii) prescribes distinct rules for the latter and their operators.
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