46It is for the national court to verify, in accordance with the rules of evidence of national law, provided that the effectiveness of EU law is not undermined, whether action constituting an abusive practice has taken place in the case in the main proceedings. However, the Court, when giving a preliminary ruling, may, where appropriate, provide clarification designed to give the national court guidance in its interpretation (see, inter alia, judgment in Halifax and Others, EU:C:2006:121, paragraphs 76 and 77 and the case-law cited).
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