50Admittedly, the principle of legal certainty, the corollary of which is the principle of the protection of legitimate expectations, requires, inter alia, that rules of law be clear, precise and predictable in their effect, especially where they may have negative consequences on individuals and undertakings (judgment of 22 June 2017, Unibet International, C‑49/16, EU:C:2017:491, paragraph 43 and the case-law cited).
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