128In that context, the Commission must also respect the principle of legal certainty, which requires that any measure adopted by the institutions of the European Union should be clear and precise, so as to enable the persons concerned to ascertain precisely what their rights and obligations are under the measure and take steps accordingly (see, to that effect, inter alia, Joined Cases C-201/09 P and C-216/09 P ArcelorMittal Luxembourg v Commission and Commission v ArcelorMittal Luxembourg and Others [2011] ECR I-2239, paragraph 68).
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