52Finally, the 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 (judgments of 9 March 2017, Doux, C‑141/15, EU:C:2017:188, paragraph 22, and of 20 December 2017, Erzeugerorganisation Tiefkühlgemüse, C‑516/16, EU:C:2017:1011, paragraph 98).
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