55It must be borne in mind that, according to settled case-law, in the absence of relevant EU rules, the detailed procedural rules designed to ensure the protection of the rights which individuals acquire under EU law are a matter for the domestic legal order of each Member State, in accordance with the principle of the procedural autonomy of the Member States, provided that they are not less favourable than those governing similar domestic situations (principle of equivalence) and that they do not render impossible in practice or excessively difficult the exercise of rights conferred by the EU legal order (principle of effectiveness) (see Case C-201/02 Wells [2004] ECR I-723, paragraph 67 and Joined Cases C-392/04 et C-422/04 i-21 Germany and Arcor [2006] ECR I-8559, paragraph 57).
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