90It should be pointed out, first of all, that the principle of the protection of legitimate expectations, which is a fundamental principle of Union law (Dürbeck, 112/80, ECR, EU:C:1981:94, paragraph 48), is the corollary of the principle of legal certainty, which requires that legal rules be clear and precise, and aims to ensure that situations and legal relationships governed by Union law remain foreseeable (Duff and Others, C‑63/93, ECR, EU:C:1996:51, paragraph 20).
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