761The principle of legal certainty requires that EU rules enable those concerned to know precisely the extent of the obligations which are imposed on them, and that those persons must be able to ascertain unequivocally what their rights and obligations are and take steps accordingly (see judgment of 29 March 2011 in ArcelorMittal Luxembourg v Commission and Commission v ArcelorMittal Luxembourg and Others, C‑201/09 P and C‑216/09 P, ECR, EU:C:2011:190, paragraph 68 and the case-law cited).
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