33However, while the regulatory technique used is not decisive in order to establish that a tax measure is selective, so that it is not always necessary for that technique to derogate from a common tax system, the fact that it is, like the measure at issue in the main proceedings, a derogation is relevant for those purposes where the effect of that technique is that two categories of operators — those who fall within the scope of the derogating measure and those who continue to fall within the scope of the ordinary tax system — are distinguished and are subject, a priori, to different treatment, even though those two categories are in a comparable situation in the light of the objective pursued by that system (judgments of 21 December 2016, Commission v World Duty Free Group and Others, C‑20/15 P and C‑21/15 P, EU:C:2016:981, paragraph 77, and of 28 June 2018, Andres (insolvency of Heitkamp BauHolding) v Commission, C‑203/16 P, EU:C:2018:505, paragraph 93).
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