38While it is ultimately for the national court, which has sole jurisdiction to assess the facts and interpret the national legislation, to determine whether the practice at issue in the main proceedings constitutes discrimination prohibited by Directive 2000/78, the Court of Justice, which is called on to provide answers that are of use to the national court, may provide guidance, on the basis of the file in 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 in the particular case pending before it (see, to that effect, judgments of 14 March 2017, G4S Secure Solutions, C‑157/15, EU:C:2017:203, paragraph 36, and of 6 March 2018, SEGRO and Horváth, C‑52/16 and C‑113/16, EU:C:2018:157, paragraph 79).
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