51As regards the principle of legal certainty, that principle, which is one of the general principles of European Union law, requires that rules of law be clear and precise and predictable in their effect, so that interested parties can ascertain their position in situations and legal relationships governed by European Union law (see Case C-81/10 P France Télécom v Commission [2011] ECR I-12899, paragraph 100 and the case-law cited).
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