32On the other hand, in so far as the question referred by the national court, as reformulated in paragraph 21 of this judgment, seeks an interpretation of Articles 81 EC to 89 EC, it should be recalled that the need to provide an interpretation of EU law which will be of use to the national court requires that the national court define the factual and legal context of its questions or, at the very least, that it explain the factual circumstances on which those questions are based (see Centro Europa 7, paragraph 57 and the case-law cited). Those requirements are of particular importance in the area of competition, where the factual and legal situations are often complex (see to that effect, inter alia, Joined Cases C-320/90 to C-322/90 Telemarsicabruzzo and Others [1993] ECR I-393, paragraph 7; Case C-238/05 Asnef-Equifax and Administración del Estado [2006] ECR I-11125, paragraph 23; and Case C-250/06 United Pan-Europe Communications Belgium and Others [2007] ECR I-11135, paragraph 20).
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