79It is therefore important that the recipient undertakings have actually been entrusted with the discharge of public service obligations and that those obligations are clearly defined in national law, which presupposes the existence of one or more acts of public authority defining with sufficient precision at least the nature, duration and scope of the public service obligations incumbent on the undertakings entrusted with the discharge of those obligations (see, to that effect, judgment of 20 December 2017, Comunidad Autónoma del País Vasco and Others v Commission, C‑66/16 P to C‑69/16 P, EU:C:2017:999, paragraphs 72 and 73).
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