54In that regard, it is established case-law that where Member States adopt measures by which they implement EU law, they are required to respect the general principles of that law, which include, inter alia, the principles of legal certainty and protection of legitimate expectations (see, inter alia, judgment of 3 September 2015 in A2A, C‑89/14, EU:C:2015:537, paragraphs 35 and 36 and the case-law cited).
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