79While it is ultimately for the national court, which has sole jurisdiction to assess the facts and interpret the national legislation, to determine whether those requirements are met in the case in point, the Court of Justice, which is called on to provide answers of use to the national court in the context of a reference for a preliminary ruling, may provide guidance, on the basis of the documents relating to the main proceedings and the written and oral observations which have been submitted to it, in order to enable the national court to give judgment (see, to that effect, judgment of 17 July 2014, Leone, C‑173/13, EU:C:2014:2090, paragraph 56 and the case-law cited).
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