128Specifically, in order to meet the requirements of that principle, legislation must enable those concerned to know precisely the extent of the obligations imposed on them, and those persons must be able to ascertain unequivocally their rights and obligations and take steps accordingly (see, inter alia, ArcelorMittal Luxembourg v Commission and Commission v ArcelorMittal Luxembourg and Others, C‑201/09 P and C‑216/09 P, EU:C:2011:190, paragraph 68 and the case-law cited).
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