22In that connection, as regards the alleged breach of the principle of legal certainty, it must be recalled that that requires that EU rules enable those concerned to know precisely the extent of the obligations which are imposed on them. Individuals must be able to ascertain unequivocally what their rights and obligations are and take steps accordingly (judgments of 10 March 2009, Heinrich, C‑345/06, EU:C:2009:140, paragraph 44, and of 29 March 2011, ArcelorMittalLuxembourg v Commission and Commission v ArcelorMittal Luxembourg and Others, C‑201/09 P and C‑216/09 P, EU:C:2011:190, paragraph 68).
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