43In that regard, it should be observed that, according to settled case-law, which is now reflected in Article 94 of the Rules of Procedure of the Court of Justice, 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. The order for reference must also set out the precise reasons why the national court is unsure as to the interpretation of EU law and considers it necessary to refer a question to the Court for a preliminary ruling (judgment of 19 December 2018, Stanley International Betting and Stanleybet Malta, C‑375/17, EU:C:2018:1026, paragraph 29 and the case-law cited).
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