50It follows that a system of taxation is compatible with Article 90 EC only if it is so arranged as to exclude any possibility of imported products being taxed more heavily than domestic products and, therefore, only if it cannot in any event have discriminatory effect {Commission v Luxembourg, paragraphs 21 to 25; Haahr Petroleum, paragraph 34; Case C-375/95 Commission v Greece [1996] ECR I-5981, paragraph 29; Case C-68/96 Grundig Italiana [1998] ECR I-3775, paragraph 12; and Brzeziński, paragraph 40).
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