69In order to determine whether the Commission was entitled to carry out such a new investigation, it should be noted not only that the principle of legal certainty requires that Community legislation must be certain and its application foreseeable by those subject to it (Case 325/85 Ireland v Commission [1987] ECR 5041, paragraph 18, and Case C-63/93 Duff and Others [1996] ECR I-569, paragraph 20), but also that its application must be combined with that of the principle of legality (Joined Cases 42/59 and 49/59 SNUPAT v High Authority [1961] ECR 53, 87).
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