20In that connection, it should be noted that, according to settled case-law, the need to provide an interpretation of European Union law which will be of use to the national court makes it necessary that the national court define the factual and legal context of the questions it is asking or, at the very least, explain the factual circumstances on which those questions are based (see Case C-380/05 Centro Europa 7 [2008] ECR I-349, paragraph 57 and case-law cited, and Case C-384/08 Attanasio Group [2010] ECR I-2055, paragraph 32). 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, and Attanasio Group, paragraph 32 and case-law cited).
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