68Secondly, it follows from case-law that, while the principles of legal certainty and of the protection of legitimate expectations require the withdrawal of an unlawful measure to occur within a reasonable time and regard must be had to how far the person concerned might have been led to rely on the lawfulness of the measure, the fact remains that such withdrawal is, in principle, permitted (see, in particular, Joined Cases 7/56 and 3/57 to 7/57 Algera and Others v Common Assembly of the ECSC [1957] ECR 39, at 55 and 56; Case 14/81 Alpha Steel v Commission [1982] ECR 749, paragraph 10; and Case 15/85 Consorzio Cooperative d'Abruzzo v Commission [1987] ECR 1005, paragraph 12).
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