31As regards, secondly, Articles 81 EC and 82 EC, although it is true that they are concerned solely with the conduct of undertakings and not with laws or regulations emanating from Member States, those articles, read in conjunction with Article 10 EC, which lays down a duty to cooperate, none the less require Member States not to introduce or maintain in force measures, even of a legislative or regulatory nature, which may render ineffective the competition rules applicable to undertakings (see Cipolla and Others, paragraph 46 and case-law cited).
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