30In the absence of harmonised legal procedural means available to consumer protection associations to prevent the continued use of unfair terms both in the interests of both consumers and competitors, it is for the internal legal order of each Member State, under the principle of procedural autonomy, to establish such rules, provided however that they are not less favourable than those governing similar situations subject to domestic law (principle of equivalence) and that they do not make it impossible in practice or excessively difficult to exercise the rights conferred by European Union law on consumer protection associations (principle of effectiveness) (see, by analogy, Case C‑415/11 Aziz [2013] ECR, paragraph 50, and Case C‑565/11 Irimie [2013] ECR, paragraph 23 and the case-law cited).
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