320However, those requirements cannot be interpreted as precluding the EU legislature from having recourse, in a norm that it adopts, to an abstract legal notion, nor as requiring that such an abstract norm refer to the various specific hypotheses in which it applies, given that all those hypotheses could not be determined in advance by the legislature (see, by analogy, judgment of 20 July 2017, Marco Tronchetti Provera and Others, C‑206/16, EU:C:2017:572, paragraphs 39 and 40).
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