48In that regard, although questions concerning EU law enjoy a presumption of relevance, as was observed in paragraphs 20 and 21 above, it is settled case-law that the need to provide an interpretation of EU law which will be of use to the national court makes it necessary for that court to define the factual and legal context of the questions it is asking or, at the very least, to 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 14 June 2017, Online Games and Others, C‑685/15, EU:C:2017:452, paragraph 43 and the case-law cited).
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